Hallo Kevin.
here v0.8 : https://gsm.tsaitgaist.info/SIMtrace/v0.8/ Compared to v0.7+, I added 2 1n4148 after the parallel voltage regulator outputs. I wanted to avoid the regulators to fuzz each other, but I don't know if it's right. Maybe an additional zener diode is also required.
Hmm. The diodes will cause a voltage loss of about 0,7V ;-/ Maybe you will need something more tricky or just add a little switch. I think nobody will change the power supply method every minute.
regards. Philipp