Per the Fluid Compatibility Guide at Marco Rubber
, NBR (aka Nitrile Buna-N) has "excellent" compatibility with sewage. Looking at the cross-section diagram on that valve's page, though, it's clear that the maximum size object it'll pass is much less than the 1-1/2" pipe it attaches to. Success might depend on how small the toilet grinds things.
Since you picked an electric valve it's obvious you want automation or remote control. What about a traditional bladex valve with a linear actuator? Maybe some Actobotics
gizmos to build a rack and pinion, or a wheel with a lever attached (thinking along the lines of the drive mechanism on a steam locomotive)...