I am currently using FleX UE integration direct from the nVidia FleX branch on GitHub. I have it working however I am not sure how to enable it if the object is in a blueprint. The screenshot shows what I mean:
You should add “Flex” component (not Static Mesh) in your blueprint, and specify your static mesh in this component. The static mesh shoud have Flex Asset specified as well (but looking at the picture you have it already done).
Usual Blueprint Actor will work, it’s not required to create subclass of it (FlexActorBP etc).