I ask because I have been playing a 4 in front horn for about 6 months, and Iíve gotten used to using my right pinky for 4, but just recently a dormant case of repetitive stress injury in my right hand has re-emerged.

So I got wondering whether it might work if I switched off between my front valves and a horn with top valves, and then realized that Iíd be relearning 4th valve fingerings, just as Iíve begun to develop some facility playing right pinky 4. Then I realized

Is there some mechanical reason why a top 4 compensating horn couldnít work? Could an older horn be adapted?

I canít seem to find references to this question anywhere. Have I missed them somewhere?