Did my grass yesterday. Tested the new brake on my .375 today. Couldn't make them all touch, but close enough for moose and elk. LOL
A hexagonal punch for the bee brood or wax paper will be needed.
I slightly large round disk might work, but will be fiddly.

9 pound onion skin is common, but use what is needed to get a snug fit.
Simplicity patterns are thinner yet. Keep that in mind.
I've patched with .003" printer paper and it worked just fine.