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If you have enough clearance for tyres and like the geometry sure why not. I am a strong believer in aggressive geometry for sscx, no doubt.
The studs are really realy cheap from ceeway, but I have actually had great succes cutting them off trashed frames and reuse them.You could make something like this
But they don't need to sit perfect. You can make the brake work even if you just eyeball it.
What I am saying is that, although risking your frame, you could do it yourself or get a local blacksmith to do it for a case of beers.
Because getting a frame builder to put on cantilever studs is going to cost you money + money for new paint. And still the frame will not be optimised for mud and big tyres.