what can I say, sounds like you have a good plan. You can send me the setup and I will sort it out for you ;-)
I too am looking a good boot selector.
Are you going to install amigalon with that QNX install?
If so, I don't know if it will work with that GFX setup, I remember something about it only working on old nvidea cards. Maybe there a patch by now.
If you get a chance to test it, I wonder if winUEA can be run with wine.
good luck and let us know.