Hello!
ED, I'd like to propose a thing that I think will save you time and money!
Only make Hotfixes for Release Version - Don't make them for Open Beta Version.
If something is broken in the OB version? Patch it the next, normal, beta patch. (and don't push that OB version to Release!, ofc).
That way OB is still a Beta, and when you push to Release, it will be more polished. And you'll save yourself some "last minute fix-work" that is disruptive for good production flow.
//Jarl