Yes, adaptors work fine.
Yes, it's relatively easy to mod since the switches are PCB-mounted ..
Yes, it's a very nice keyboard ...
However, the used ones have been in service at either medical clinics or hospitals,
BE VERY CAREFUL WHEN HANDLING IT !!!!
It should absolutely be disinfected BEFORE being allowed in your home,
10% Hydrogen peroxide for the caps and case,
Isopropylic Alcohol for the PCB .
I'm dead-serious here, You could contract nasty stuff from handling a dirty G80-1501
People who have a G80-2100 tend to know what it is .
Only an imbecile would sell loose caps, even if defective this thing is worth good money .