A solution to NOT drill your track forks and have a normal front brake nonetheless

I wasn't talking about tensioning headsets, I was talking about putting sideways leverage on the two types of proposed fixings in question, buy using an obvious comparison. Hence the "theoretically" bit.

Attaching bars to a SFN bolt is technically impossible unless you weld/gaffa tape/ziptie them.

I know that you meant "handlebars+stem" instead of just handlebars, that was clear, nonetheless the comparison makes no sense, because there is nothing, no ridge or anything else on a normal stem that stops it from sinking deeper when you start tightening the bolt (but the stem curve itself on the top, but that'd be, as said, uneven distribution).