Soldering of additional memory?

I know that it is not considered possible to add extra memory to a MacBook Air/Pro that has soldered memory chips.

However, I am aware that some people have successfully managed to solder additional capacity memory chips on to a non upgradeable MacBook:

https://hackaday.io/project/164191-macbo...

I wouldn’t try to do this myself - certainly not with a heatgun and I don’t have the soldering skills to us an IR solder even if I had access to one.

If the extra memory chips could be bought (and it seems that they can be) would it be worth risking an otherwise working Macbook Air/Pro if the job was done by a competent PCB soldering provider?