Sell the thing, and buy a Pegasos if you don't want to wait for OS4. (if you hate linux *that* much.)
If it were me, I would just run linux on it. Spend some time learning the BASH and KORN shells, and how to write scripts with them. (The knowledge you gain by doing so is invaluable!)
There are things you can do with LinuxPPC, and it really isn't that difficult. The first thing you have to do is get over any fear of destroying the install, and try different things in linux. There are games, tools, and quite a few other things you can do under linux. Besides, the other option is a bit on the extreme side ;-)