I was able to work something out with this code: https://forums.unrealengine.com/t/is-there-a-way-to-set-gravity-to-zero-in-uefn/1883070/7 . But I switched the zero gravity value for -9.81. This makes characters shoot upwards when entering the affected area. I would imagine that, for gravity wells and planets, I’d have to go for 0G and follow your advice to push rather than pull.
Anyway, with the gravity customizer in the link, the device makes characters shoot upwards, but the camera gets wonky when the character reaches the ceiling (naturally). Vehicles were unaffected by the device. Guess I have to keep coding to make that happen. Still, I suspect that even then, the character won’t be able to walk on the ceiling on account of being in a perpetual falling state. Same for vehicles.
So the question remains: is the idea feasible in UEFN? Are there too many guardrails that would prevent an Escher-esque level?