Nomally with resin mounts I hold the handle and gently heat the blade near the handle with a propane torch while holding the handle in an upright position. The heat travels upward into the handle, melting the resin.
If you keep your hand on the handle, (or the blade) you can guage the heat buildup. Take it slowly so you do not remove the temper from the blade, but should come loose in about 20-30 seconds.
In your case, since you do not care about the handle, I would heat the handle with the blade tip up until the handle falls off.
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