levi
Still fresh, damnit!
Have you had a look at Pandafe recently? It's a bit tricky to get set up I find, but once you've done it'll give you access to all your console emulators under one icon. I'm not sure what computer emulators it can be made to work with, but it comes with MSX, C64 and Colecovision categories by default. Just BBC and TRS-80 missing from your list.