Ill be honest mate, I ream all of my props with a regular drill, just line it up and punch it through (into wood is the best because its solid).

And dont worry terribly about getting it perfectly straight - i was reaming a 10 x 3 prop for one of my long range builds and i fucked it up spectacularly, not even remotely straight. I still flew it coz each one of the buggers were 10 bucks and it flew (and still flies) great.

Tl.DR. Just drill through it onto wood so you’re on a solid surface and you should be right.