Yes. Loosen the f/b extension in the usual manner. The little blocks are pieces of aluminum that I have warmed in an oven, now I would use a silicon heating blanket.Fascinating. Where did you make the cuts to saw the neck off? Do you have any pics?
Next I pulled the 15th fret and tried to steam the neck off as usual. It wouldn't budge (I use a jig that presses on the heel), I won't show pictures. Saw the neck of thru the heel
Remember that there is a truss rod lurking in there.
A closer look at the dovetail
Clean it up and install two threaded inserts in the heel. Notice the anchor end of the truss rod.
Floss the heel until the angle is correct. Drill a couple of holes thru the neck block and bolt it together from the inside. Lightly glue the f/b extension back down.
Clean up the frets (replace the 15th if you removed it to try steaming). Make a new saddle and do the setup
It doesn't look too bad considering...