This site should help to describe the process and kit needed to undertake what you are trying to achieve with the enlarger leans (microscope objectives can be used too) - see here:
http://extreme-macro.co.uk/componon-28mm/
Another vote for WeTransfer here - I use it all the time.
Stacking is a method of increasing depth of field in a final image by taking multiple images of a subject each focused at a slightly different point and then merging them together so that the final image displays all of the in-focus parts - Helicon Focus is the software often used to merge the images but there are other s available such as Zerene Stacker - I use Helicon - see here:
https://www.heliconsoft.com/heliconsoft-products/helicon-focus/It is a method most often used in macro photography but can also be used in landscape. For the macro aspect see here:
http://extreme-macro.co.uk/focus-stacking/
Yes, I own and use a Manfrotto 405 for stacking macro shots and, so far, have been happy with it. In the review you posted the reviewer does state the following: "Does it mean that I do not recommend the Manfrotto 405 Pro to our readers? No, of course not. While it does not work for me for the above-mentioned reasons, it works very well for many photographers. A number of medium format and DSLR shooters rely on this head for their photography needs and are quite happy with their choice. The versatility of the head is very impressive and the fact that it is always locked and does not fall to the side like ballheads do when loose is very important in keeping gear protected and safe. Those features alone are worth the money for many. Lastly, not everyone needs the absolute rock solid stability that I require for my setup." - I think for many, if not most, people thay would find the head acceptable and useable.
The Arca-Swiss C1 is definitely 'better' BUT at a heavy cost.
I would recommend from personal usage a Gitzo Systematic Series-4. Good luck with it all.
Steve