Multiple fingers, really?! I've never had that, not for a rectal exam, just the bimanual vaginal exam. My GI uses his index finger, I think. My backside vision isn't the greatest, but that is what I feels like. That is how they dilate before inserting the scope.
I am not sure that stating you have a j-pouch would make any doctor alarmed and know that a rectal exam should not be done. It is not as if it is a bear trap in there. But, all kidding aside, I REALLY do not think you need to be concerned that some damage has been done.
Jan