I believe you would be able to just not use callouts.
As far as I have understood you prioritize compatibility with GitHub. Insofar obsidians syntax for the default status of folding doesn’t make sense. So why not using the same method for (un)folding callouts in bear like for folding headings and lists? I think that’s a good compromise. A command to fold all callouts in one note would then be the finishing touch.
This is a fantastic idea.
Thanks for sticking with the GitHub colors!