I've done a couple of tests of those hinges and that glue, one just a couple of days ago.

The tests show that even a poorly glued hinge won't come out. It takes complete destruction of the wood around it before it's free. Same was true with epoxy when I made sure the holes in the flats were filled before inserting. So I haven't used backup pins or toothpicks or anything since tumbling to what those holes do for you. I've got a number of airplanes I built in the 70's. None have the backup pinning. I fly some of them every so often. I'd bet my car you couldn't get the hinges out. But it's up to you and your confidence in your building ability. And it helps your confidence to try a test installation in some scrap wood.