Edit: @JonRaymond beat me to it - but here are the details:
NOTE: I have not yet tried this myself. I’m lucky enough to be on a sunny island some 4,500 kms from home. If you try this at all, be prepared for misbehavior until me or someone else (you?) can confirm.
Find “Pause G-code” in your printer profile. It looks like this:
M400 U1
Trivially add the gcode for homing XY (and some comments) so it looks like this:
M400 U1 ; Pause for user intervention
G28 X Y ; Home the X and Y axes in case they were upset
Save it as a user profile and use that from now on. EDIT: see caveat about repeatability below.
See @BambuLab I already did half of it for you! 
Now please tweak the firmwares so the home button(s) only homes XY when pressed during a printer pause. Must be fixed everywhere: On printer, in Studio and in Handy.
EDIT: Looking at Marlin docs, it says “By default “G28” disables bed leveling. Follow with “M420 S” to turn leveling on.” and then some exceptions to that statement for newer versions and depending on how it was built. A quick look at Bambu’s G-codes indicates such command shouldn’t be needed, and that Bambu seem to use “G29.2 S1” for that if it would be.
The fact that Bambu doesn’t just provide us a list of what G-codes are supported or not is ridiculous.