I wouldn't expect an exhaust plume passing through a wormhole to move the wormhole itself (or the heavily curved "portals" at its ends) any more than a plume wo

I wouldn't expect an exhaust plume passing through a wormhole to move the wormhole itself (or the heavily curved "portals" at its ends) any more than a plume would move "flat"/"normal" spacetime. Separately, Kurzgesagt did a video on stellar engines (which can be much less exotic than wormholes); sounds like what you're describing: https://youtu.be/v3y8AIEX_dU https://youtu.be/v3y8AIEX_dU