This is definitely a possibly solution to the problem of keeping your propeller/wheel alive, but does present some problems in its own right. As another comment

This is definitely a possibly solution to the problem of keeping your propeller/wheel alive, but does present some problems in its own right. As another commenter stated, dead objects like teeth, hair, nails, claws, and scales tend to break and once broken cannot be repaired without entirely replacing the object. As well, growing a structure with a complex form like a propeller requires providing nutrients and removing waste from the structure while the cellular scaffolding is forming. Thus we are still faced with the issue of nutrient transfer, though I can imagine a multistage process in which the structure is initially non-rotating and then the connective tissue atrophies to free the now-nonliving rigid body.