That sound normal.
Will be very tight.
I wouldn't bother with an air gun, they dont normally shift them.
Use a decent short socket, preferably on a 1/2 drive ratchet rather than a knuckle bar (Knuckle bars in my experiance give too much), with a jack handle as extra leverage.
You also need to hold the crank. preferably with the special tool or lock the flywheel via the ring gear (Can be difficult).
Other than that a bit of brute force is needed.
Ive never had a Honda Crankshaft pulley bolt shear. (In all the Honda's Ive worked on)
The tightness is between the bolt washer and the pulley face rather than the threads of the bolt.
Steve M
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Its all gone Norfolk!!!
Now in the Lotus position.