My guess is no? The chain must rotate in order to roll that rear tire!
That's because the after market bafang mid drives in the BBx series contain a built in clutch. Some bafang mid drives for OEM's don't have a clutch and don't possess a throttle. Some do. Most other oem mid drives do not have throttles. Probably never will as it would require major re-design.There is no reason that a mid drive won’t work on throttle only. Basically there is a one way bearing on the cranks that allows for the chain ring to rotate while the cranks can stay stationary.
For example all the very popular Bafang kit middrives operate throttle only, but also have a PAS. The BBSHD is capable of running at high watts for a kit system and the Ultra will also as an integrated.