Nice work, I've tried a few different options for tilting and lifting cabs over the years, and I agree, many are too shallow as they're designed for guitar amps.
Your solution looks excellent.
There's the Fishman Fission? Gives octave up, forth below and 5th above.
Very lightly dialed in might be worth a thought?
https://youtu.be/I2XKZNMR2Pc?si=Nru8jA1-zZ2A1wxi
Originals band and the guitarist could commit to gigs due to his work schedule being unpredictable (fair enough). I tried to bring up the idea of finding a dep for the gigs he couldn't make but that didn't go down well. Broke up shortly after.
I saw Ash play recently at Rock City in Nottingham. It had been a good few years since I'd seen them last but it was a really great night. Great sounds. Great vibes.
Went to see Jesca Hoop at Metronome in Nottingham last night.
Intriguing performer. Lovely voice and unusual (I think delicately palm muted) guitar style.
Great sound in the venue.