I don't have an MCF-10, so I can only give pointers, not step-by-step instructions ...
I have built myself a midi pedal board, using the pedals from an old Lowrey home organ. I have added 5 switches, one of which acts as the page turn command for Mobilesheets. What I did was set that switch to send an 'E -1' (midi note 16) on channel 15. An E -1 is too low for the Genos to play, but can be watched for by Mobilesheets. In the midi settings of MobileSheets, make sure the channel is set to whatever channel the MCF-10 is using. Then under Midi Actions, I suggest using the "Activate Link or turn to next page". The Midi command is Note On, Value is 16. The Activate Link or Turn page allows you to set links to jump you to the correct next page, if needed.
So, if you can program the MCF-10 to send a note event, you should be able to do the same sort of thing.
Hope this helps!
Adam
PS. In Mobilesheets, did you know that you can set custom page orders? Including duplicates? So for example a song that has a repeat back to page 2 and the second ending is on page 4: On the files tab, set the pages as 1,2,3,2,4.