I had a few like this...
My trick was to leave the rat in the warm side of the cage overnight. Didn't work 100% of the time, but now that's the only way one of mine eats them! All of my hatchlings were started on F/t this way, as well. They now strike with pleasure, though some prefer it be left for them to eat right after I leave the room, lol.
EDIT: woops, I saw that was one way you tried.. Sorry. Some people believe there are some that are live feeders only... though I've been able to convert the ones I've taken whose previous owner said that with no problem. But I used most of the methods you tried. Have you tried combining methods, like cutting the top of the head open, then leave it overnight? Cutting the nose open doesn't do much but make it bleed, unless you cut deep enough to get some cranial fluid to come out.
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