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Yes, basically that's no different to cutting a slightly wider slot and gluing them in. The difference is that you are reducing the barbs in relation to the saw kerf whilst I am widening the saw kerf in relation to the barbs. I use Fish glue, you use HHG. The Fish held the fret a little better in my tests but HHG certainly worked.
Your experience with the Mandolin was similar to my experience with early romantic guitars. Except I had the fretboard splitting at the very last fret (fretting on the Guitar). They are very thin Ebony fretboards, much thinner than your average Guitar. Fretting off the guitar just results in a huge back bow and a board that distorts across it's width.
The idea of using a slightly wider slot and gluing them in was an obvious potential solution. A few tests later and I needed no other form of encouragement.
That's the beauty of making different types of instruments. You hit different problems and have to come up with different solutions.