I recently picked up an old Bogen tripod and head that I wanted to set up with an Arca-Swiss quick release. There are any number of adapters available for this purpose, but since the tripod & head cost me all of $10 I didn't want to spend very much. So I headed to eBay to see what I could find.
I ended up buying one like this:
https://www.ebay.com/itm/Quick-Release-Clamp-1-4-to-3-8-Adapter-Screw-ARCA-Swiss-Standard/264888974993?hash=item3dac9cfe91:g:GsgAAOSw~5ZffAQhThat arrived in a few days and I was pleasantly surprised how nicely made it was! The existing 1/4" screw simply screws into the bottom of this QR adapter. Note: I will be drilling and tapping a second hole in it and the old platform of the tripod head, to be certain it can't loosen accidentally. I don't trust a single mounting screw. I suppose some red Locktite also could serve similar purpose, for a permanent installation (use blue Locktite instead if you ever anticipate wanting to remove it in the future).
The Arca-Swiss style system is by far the most common and universal type of QR. Many manufacturers make platforms and plates to fit them, as well as a wide variety of other products. While there is some small variation, for the large part they're fully compatible across a large number of brands. You can find adapters costing anywhere from $10 to $100. I wanted something pretty basic and saw no reason to spend very much on it (some years ago I spent a lot more for a more custom type of Arca platform to convert a ballhead).
As you can see, the adapter I got uses a thumbscrew to tighten and clamp onto the plate (which is in turn relatively permanently mounted on the bottom of the camera). Since you're concern is arthritis, you might prefer one with a lever that actuates the clamp mechanism instead. For example:
https://www.ebay.com/itm/CL-50LS-QR-Clamp-Mount-Adapter-w-PU50-Plate-for-Arca-Swiss-Tripod-Sony-Canon/293788367069?hash=item446726b8dd:g:s30AAOSws9dfbrB2There are many others to choose among. Here's an eBay search (which unfortunately can't be done without getting some other Arca-related items mixed in):
https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=arca+swiss++adapter&_sacat=0&LH_TitleDesc=0&_osacat=0&_odkw=arca+swiss+platform+adapterMost of those adapter platforms come with a "generic" or "universal" plate to use on the camera. Those often rely upon a bit of rubber to keep them from loosening. The generic plates might work, but can loosen under certain circumstances, particularly if you use longer, heavier lenses that put some torque on the mounting point. That can lead to the camera "drooping" when the plate loosens or even be risky if you often carry or move around the tripod with the camera already mounted on it. Depending upon what camera you need it for, there may be a better "custom fitted" Arca plate available for it. This is where you might want to spend more money for something better. They typically cost around $50, but sometimes there are bargains for these, too.
For example, recently I was looking for an custom fitted "anti-twist" Arca plate to use on a Canon M5 mirrorless camera. There aren't a lot of them made and most cost $40 to $50. However, once again I looked on eBay and found one similar to, but cheaper than this:
https://www.ebay.com/itm/Aluminium-Vertical-Shooting-L-Plate-Bracket-Holder-Grip-For-Canon-EOS-M5-EOS-M5/333744752145?hash=item4db4bcc611:g:djoAAOSwwD1d7Q0ZThe above is a type of Arca camera plate called an "L-bracket". While they are a bit larger than the simple, bottom mounting plates, an L-bracket provides two mounting points: one to orient the camera horizontally, the other vertically. This is particularly handy when using a ballhead, because either mounting positions the camera nicely balanced atop the ballhead, rather than having to "flop" it off to one side where the rig can be unbalanced. The L-bracket that I ended up buying actually cost less ($16) and is a little more streamlined or compact than the one shown at the link above. And it is modular. The end piece can be removed so that only the fitted bottom plate is used on the camera. While this L-bracket was also made in and sold from China, I was once again pleasantly surprised how quickly it arrive, how good fitting and well made it was! (Also, none of the more expensive options was a modular L-bracket. For almost triple the price, they were only bottom plates.)
Of course, unless you are shooting with a Canon M5 too, the above isn't the right bracket for your cameras. But there are similar for being made for many different specific camera models. If you want one search online, on eBay, on Amazon, at the major camera stores (B&H lists over 1500 different types of plates from more than 100 different manufacturers). Over the years, I've used custom-fitted camera and lens plates, as well as various other accessories from Wimberley, Kirk Photo, Hejnar Photo, Really Right Stuff, Dolica, Smith-Victor and several "no name" Chinese manufacturers.
Hope this helps!