OK, so please tell me if this will work. I'll upload the web version as 4-color. Then I'll upload 2 .gbc files, one will be "game.gbc" and the other "game DX.gbc", and of course I'll have descriptions that explains the difference. I would also do the same with the .pocket files.
So anyone playing off the web will only see 4 colors, but people downloading the game to play on orignal hardware or a Pocket or whatever else they have, can pick and choose between the two versions, or download both.