How can I stop a Monti and SPS war?

[Reef Pilot]

I have a Sunset Monti that is getting a little aggressive. It is running into a nice Bonsai SPS, and the SPS is losing. How can I stop it?

I have had SPS run into each other, and they just seem to form a border with no major harm, and each seems to respect the others space (unless it got there first). But this Monti is encroaching further on the SPS, and if I don't do something, I fear the SPS might will lose out.

I was thinking of getting something sharp, like a coral scalpel and try to scrape or chip off the Monti where it is encroaching. Will this work? Or are there better methods?