I just reset the neck on an FG-180 red label Nippon Gakki.
I removed the fingerboard tongue by cutting it at the 12th fret. That gives full access to the dovetail, which can be 'drilled' using a small steel scribe (a 0.070" diameter rod that is pointed on the end) that is chucked in a hand drill. I drilled three or four times on both dovetail cheeks, and I was able to remove the neck with no water. There is some heat generated when using the scribe, but I believe the main reason I was able to remove the neck was that the drilled holes weakened the joint.
Some repair of the surfaces is required, but thicker shims will take care of it. Shimming the joint is almost always done during a reset.
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