This sounds like a job for TT
You don't know how hard that made me laugh
Seriously you couldn't have planned it better, while I'm reading his post asking if he can drill it, in my head I'm saying "of course you can".
Then that was the very next post. Bravo. Bravo.
I don't know what the discs look like, every brand is different.
But if your not taking too much material away, of course you can.
Some discs are littered with holes.
Your only going to have to make one per any way, but that doesn't mean it'll for sure work. I don't know what they look like, if they're mostly solid, do it.
Put a piece of paper on your board, over the holes. Hold it in one place so it doesn't move & take a pencil, lightly shade over 3 holes.
Use the template on top of your disc. Obviously the more precise you can do it the better it'll fit.
Take as little material away as you can, pre drill a pilot, don't push on the drill, take your time.
I would still try & find the proper/any fitting disc first
You don't wanna be killin the re-sale value yo.