Thanks for looking out, ari, but I'm already committed to finishing this rebuild. The bearing should arrive tomorrow (Friday) and I should hopefully get it all put back together Saturday and get my Civic back on the road Sunday. If things go horribly wrong I'll have no choice but to replace the transmission, or, the absolute worst case scenario, replace the car. I'll let you all know sometime early next week how it turns out.

EDIT: Friday Update! I've got the transmission all back together again! There is absolutely no wobble whatsoever on the input shaft now. And I'm a day ahead of schedule, to boot. I'll work on getting it back on the engine and with any luck my car back on the road tomorrow. I'll keep you posted.