Broken [Main] button

Hi there, new to the board.
My [MAIN] button has recently broken. Is there, by any chance, a way to access the Main screen with other button? Asking so I could actually use this thing while I wait for button replacements.

Depending on the OS you are using you can control the button from a midi controller -> http://www7a.biglobe.ne.jp/~mpc1000/os2xl/button.htm

I finally found some time to open up the unit. Luckily its only the plastic button that broke and not the tact switch, so I just took the button from "track mute" for now since I don't really use MIDI.

Thanks for the suggestion though, it should have been obvious.