Just telephoned the KPHX Tracon and asked...'IF a sidestep is required by the local controller, what IFR missed approach is expected to be flown, if necessary, and no further instructions are passed to the landing airplane?
The positive answer from the Tracon supervisor...' The missed approach procedure for the original instrument landing runway,
not the sidestep visual runway assigned by the local controller'.
Might be different elsewhere, but, this is what we do, worldwide...like it or not.
So, I would respectfully suggest...land the friggin' airplane, and STOP pressing buttons in the last few hundred feet, agl.
Of course, I expect the 'younger set' just can't help themselves.