You'll want more. 9 at the least to get a decent benefit from your buffs, those and the domain abilities will be your greatest assets to the Monk levels. As for monk levels, you want at least 6 to get the improved knockdown bonus and anything beyond that can't hurt either.
There is no reason why you shouldn't be able to switch back and forth between monk and cleric levels unless you plan on being non-lawful at some point.
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