At high level 35 MND is not that "much" in the sense you shouldn't have problem healing with 35 MND off, if you do have trouble that probably because you are lacking in skill and experience, not the MND stats (for most contents anyway, primals ex included. I don't know about savage so if you go savage you might want to switch to full INT/MND base on job every times you go in). So you can put them all into INT for your SMN, and still play SCH without troubles. My friend like to put it to PIE though :))
Just to clarify: 35 INT will worth a lot more for SMN than 35 MND for SCH (due to how healing is in this game). So if you want to play both SMN/SCH without changing stats everytime put it all to INT.
