So here is my concept for adjustable support on the other side. It's not fully flushed out, the adjustable piece would require more support on the off side and I'd fine tune the support piece to give more contact with the work at 45 since that's the most commonly used angle. But essentially the support would just rotate up to contact the work regardless of what angle the joint is.
At the common 90 degree corner:
At a 45 degree corner (like a flag box): At the 105 degree corner like on my flag box: And at the corresponding 75 degree corners on my flag box:
I'm still of the opinion that the second support is unnecessary but I'll wait to cut the jig side down until I test it on some scrap to make sure. I really don't want this build to get any more complex than it already is...
