Easiest way is to whip out the good 'ol LC575 you've been keeping 'just in case'.
I've been in sorta the same sitch, but never really bothered with it.
I'm thinking maybe get an emulator for older systems - I don't think its the OS that limits the colours and stuff, its the monitor...
However, I'm not sure how much sense it makes that a monitor can display millions of colours, and not 16...
Cipher13