Of all the things that people overthink, prop hole size is very near the top of the list. It's right up there with synthetic 2 stroke oils and what makes the best competitive aerobatic plane. Here are the facts.
1. All the hole actually does is locate the prop in the right spot on the drive washer. Friction and mechanical bite hold it in place after that. There will be ZERO side forces of any kind on an installed prop.
2. A tapered hole is no better or no worse for locating the prop in the right spot than a straight hole. A tapered hole is, however, a lot easier to get sized exactly right and only requires one inexpensive tool.
What I would do in the OP's situation is CA the closest fitting insert into place then ream it to fit exactly. The fix will be permanent and easy. There is really no good reason to go to any more trouble than that.