Okay, of course I'll do that for them, but another possibility is to leave things as they are and install a right hand thumb trigger for either the first slide or the fifth slide.
Probably, most people - if convinced to consider this alternative - would choose a first slide trigger for the right hand thumb.
Mr Bobo tended to prefer 5th slide triggers over first light triggers and - when stopping to think about it - with the fifth rotor being operated by the left hand index finger, the left hand thumb is still available to operate a fifth slide trigger... (Completely solving the horribly sharp 5234 low-D c-tuba problem)
...so - leaving things as they are, a right hand thumb trigger could be installed for the first slide and a left hand thumb trigger could be installed for the fifth slide, rather than tearing things apart and building back.
My guess is it would take about a week...How long would it take to get used to that?
How long did it take to learn how to play a C and an F tuba (as B-flat tubas were played all throughout the first 6 to 8 years of tuba playing) ?
...and me pointing out these possibilities.. I didn't think of any of this stuff. It's all been done before.