@Bearhedge: I will give it a shot.
@Troll:
This is the switch:
RKJXT1F42001
Datasheet
I only saw that it also has a rotating encoder when it arrived. But in the datasheet similar 8-way switches without encoder are also described.
It was the only affordable switch I could found. Only for testing purposes an OTTO switch would be to expensive.
Edit: I haven’t tested(wired) it yet.
Regarding the twist of the throttle: Only 30 degrees I think, but this can be increased by modifying the e-bike grip(move one of the neodym magnets).