I currently get acceptable results for Blue and Green LEDs between 3.3 VCC and their respective cathodes. I don't know exactly what goes on in the device, but when the device is unpowered a megohm resistance is measured (in both directions) between their anodes and VCC. Megohms between cathode and ground, also. (Dragons, maybe.) It'd be nice if I could continue to avoid tapping that multiplexed anode directly.

Klas-Kenny, could you suggest a part? SMT is OK, though hand-workable packages are preferred.

Justme, I think I then wouldn't be able to set an interrupt on this pin, and other complications, etc. Hoping to fix it with wires instead of code!

Hi Bobflux, you're correct that the LEDs are multiplexed. It's also fairly difficult (but not impossible) for me to reach their common anodes. That common anode does indeed not connect directly to VCC, as noted.