Short of buying a fair ground ride and hooking it up to work with MSFS I’m not sure we’ll be getting to roll inverted anytime soon 
This 2 degree solution I think would be fine for about 90 percent of ordinary flying situations.
I can’t even wire a plug so building this is well beyond me, but I might have a look at basic 2 degree commerical solutions. It’s basically a big step up from the butt kicker.