Air duel works fine & is a simple rom swap.
There's another Load of games too patched for m82 by gadgetfreak, Cosmic cop, X Multi, Dragon Breed, Hammerin harry etc.
Also An 8 in 1 switcher in development, all games run but a couple need some work in the GFX rom switching department.
A schematic will be posted one day so you can do this yourself with a few wire mods.
Is the 8in1 switcher on this forum somewhere? Can't say I have seen it before.