I see it as standard practice for a guitarist to sometimes play a range of instruments in concert Some maybe tuned differently some may have twelve strings and more delicate sound but what do you do with pianos?
I found this clip trawling about the internet and was astonished to see the relaxed courage of pianist the wonderful Brazilian performer Eliane Rodrigues, change pianos whilst on stage. Clearly the soft dampener or sustain pedal was not working so what to do? Why you change pianos!
As the performer what do you do, you entertain your audience by continuing to play whilst they change the ruddy thing!