Neck Reset: Glued Mortise and Tenon Joint on an antique parlor guitar

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Hello. I removed the back of an antique (English?) parlor guitar which needs various repairs, including a neck reset. I can see that the neck joint is a tightly-fitted, glued mortise and tenon. The mortise measures 5/16" wide and 1/2" deep. I've done neck resets, but only on dovetail joints.

Can anyone provide guidance on how to remove this neck? The only way I can think of to steam it off would be to loosen the fret board overhang, drill two holes at the inner corners of the mortise from the back all the way through, and move the steam needle back and forth. Or drill the same holes and use one of the new steamless needles.

Is it likely the heel is glued to the sides? If so, any suggestions on how to release the glue there?

Thank you in advance.

Regards,

Larry