Push the bead of the tyre out from the clinching surface of the rim and into the bottom of the valley. This should create some slack for you to now get a tyre lever in.
I did try this, made sod all difference, no way I'm going to get a tyre lever in.
@Fox started
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Push the bead of the tyre out from the clinching surface of the rim and into the bottom of the valley. This should create some slack for you to now get a tyre lever in.