I dunno if it's different between pow skis and park skis, but my brother was riding a pair of thrice mounted AR7's with FKS bindings up until a week ago, and he had no problems. He just ended up feeling like he should replace them. I honestly think you would be good to go.
What BSL's, large duke's have a long mount pattern so the heel shouldnt be an issue, griffons will be more. Most shops are gonna want you to go +1/-1 of other mountds depending on the hole patterns get a clean re-mount, but ON3P's are bomber and can definitely take it.
I took the MFD plates off my Caylors and remounted with Dynafit Radicals and FKS140 patterns using inserts. Some holes are close (less than 1 cm apart) but the mount seems pretty solid so far and I've ridden the ski with both bindings.
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