I haven’t tried this but it sounds like an easy way to do it.
dh has one of those big drills with ALL KINDS of different sized bits for it. I’ve been able to find the size I need for every doll so far, luckily. I have him do it for me though, I’m afraid it will get away from me, lol. He drills it, then I file down any rough edges with a file. Works perfect for mine
I use a beading tool that you can make a hole in something and make it into a bead -it is some what like a rat tail file but finer -works really well for me !!! I got it at Walmart in the craft section