I had trouble finding that particular bit and settled on 17/32, as I recall. It requires a tiny bit of relieving with a rat tail or sandpaper around a dowel, but in my experience a little too tight is better than a little too loose. With differences in patch thickness here and there, that could be an issue.
Long and short, if 35/64 is hard to come up with, drop down one and you'll still be fine. Even with the 35/64, you'd ideally need to do a little smoothing inside and your patch/ball would still be tight enough to avoid pop outs.