Idch, just stringing up the neck isn't going to be the real test. The neck has to carry that load for years, plus the vibration of the strings, you handling the guitar as you play, and the odd knocks, when it bumps into things.
Let me say this again: there are well designed glue joints and there are poorly designed glue joints.
Think about this... wouldn't it be easier to make a tilt-back head with a butt joint instead of a scarf? If you wanted a 7° tilt, just crank the table saw blade over 3½° and trim the ends of the neck blank and the headstock. I've got a saw blade that will leave a cut surface smooth as glass, for a perfect gap-less fit. People keep repeating the glue is stronger than the wood. This should work shouldn't it? But, when have you ever seen a guitar with that kind of head joint?
You haven't because it doesn't work. Good glue joints put the glue line in shear. The glue line is much weaker when the forces are trying to peel it apart. A headstock butt joint is mostly in compression, but, the string tension is trying to straighten out the headstock and puts a prying load on the glueline. The glue might be strong enough to allow it to be strung up and played. But time under load and a stray bump would be all it takes to fail that glue line.
A scarf joint also has that prying load, but, it's spread out over a larger area to reduce it's intensity. The tapered thickness make it more flexible, transmitting less load to the very edge of the glue line.
A quick google finds that the string tension for a 25.5" scale guitar is 122 lb. The height from the strings to the glue line between your bolt-on and the tenon is what? 2" maybe? So, your glue line has a prying load of 244 in-lb. That's why I suggested you put screws into the neck. The glue line at the headstock end of the surface is in tension.
I'm an aerospace structural engineer. I work with carbon fiber and much of it is put together in bonded joints. I don't know the specific strength of the glue you're using or the wood for that matter, so, I can't guarantee that your neck joint is going to fail. I can only tell you that after all that work you've put in, a couple screws are cheap insurance.