Tell us about yourself!
Do a search for an electronics failure analysis lab....they may do it for you at reasonable cost. A forensic lab may have one to or a local college, they are used with Scanning electron microscopes.
See one can learn something at any age...never thought of that! ThanX
Soldering is very OK IF!!! the solderer is using the right high power iron so that the speed of solder is fast enough to keep the heating effect very low. Low watt irons and long dwell times are what is the problem. But in general you are correct, as there are too many "tech" who don't really have good solder techniques so they should not be doing it.
There is another technique for making small rings. Drill hole into coin, put on tapered metal rod..some files work, and then tap the coin edge with a spoon repeatedly. You will see the coin start to flatten and widen. There is a YouTube on this as well.
You making a mountain. As it is NOT wrong to do so. Also just cuz YOU or someone else says it is wrong, does NOT make it wrong for me as I did not make any promises to NOT destroy coins. If someone else thinks its wrong then they should not do so!