One thing I forgot to mention in the OP was an idea I had that I’m going to test out on this pedal.
Basically, a SPDT DIP switch will route power directly to the rail OR to standard power filtering.
The idea is that having power filtering on when using a battery kind of negates some of the positive aspects of battery use on Fuzz.
Obviously a 1590A can barely fit all components, let alone a battery but I’ve fashioned up these little boxes that I used for power my garland lights for Christmas. Basically a 2.1 mm plug wired to a 9 vDC battery box with an external switch. If you want battery power, you flip the DIP switch to the “Direct” setting and plug the box in.
I plan on shipping one of these boxes with all the giveaways.