I like the way you think. I had a similar idea using SR rather than GR... According to SR, simultaneity is relative for different frames of referance, so if an event (the simultaneous occurance of two things at a single moment, such as at 1 sec, particle A is a distance D from particle B) is observed to occur in a particular way in frame S, it will occur differently in frame S'. Therefore, if you take into accout the observations of a specific interaction from two different frames (and resolve the differences in simultaniety between frames), you may be able to determine both position and momentum at the same moment, overcomming the uncertainty principle.
Quantum spin assumes the electron takes up physical space otherwise it wouldn't be able to spin. This means that it's not a point, but that it has a surface (although the electron's radius hasn't been determined). All this implies that (assuming electrons can overcome the coulumb force between them) they can touch each other, and therefore the amount of space-time curvature has a limit. The limit is the distance between the centers of the two kissing electrons, ie. 2Re. That is the maximum amount of their influence on space-time.
If electrons were points, then the smallest distance between them approaches zero, not 2Re. If this were the case, each electron would be composed of an infinate amount of energy, and would curve space-time to the point where it's discontinuous at the electron's center. This type of behavior only resembles something similar to a black hole in the quantum scale.
Personally, I don't know what to think.