I think it’s clear enough to be a little scary, as it involves surgery. I’m sure it works fine, but I think a more…how you say…mainstream approach would be more comfortable for me.
Maybe the simplest thing is to use 2 batteries, one on the H1 adapter and one on the Flyer. A bit heavier, but I guess that’s the only drawback. And for those of us who are lucky/unlucky enough to have brand new Canon batteries that work OK, it may mean — for now — just getting AB batteries to run the flyer alone.