I got an Ibanez Promethean P20 a couple of months ago to replace the rather rattly Blackstar Fly 3 with Extension 'cab'.
I love the Promethean!
Recommended!
https://www.thomann.de/gb/ibanez_p20_promethean.htm
ABY switchers let you split a signal to channel A, or channel B or both channels Y.
Better explanation below
https://www.radialeng.com/understanding-aby-switchers
I'm not sure if I'm getting the wrong end of the stick, but would an A/B/Y pedal do what you're looking for?
Apologies if I've got it wrong.
*Also, Palmer pedals are very,very well made!
With regards to the missing avatars, Ricky4000 has them.
I can't tell you how or why, but he's very sorry & says it won't happen again, & he definitely didn't sell them to finn bass users
This is a great idea!
Tell the lovely Mrs Bubinga that you bought it as a reward for when she has learnt to play the bass - an activity that you can share (she will approve of this) - you can duet on bass - tell her it'll be romantic