I want to add a mid-drive motor (#Bafang or more likely #Tongsheng TSDZ2) to this #Cetma:

https://social.ridetrans.it/@Andres4NY/109468987375343649

It has an Enviolo/Nuvinci rear hub, and an #EccentricBottomBracket to tension the chain. I don't really want to switch away from the Nuvinci to a derailleur, but the motor will most certainly not permit the eccentric BB to move & will be replaced w/ an adapter.

Any else done this, and have a suggested chain tensioner model that will work w/ this kind of hub?