Grease gun ? pump it from the same side as the air gun? They build up quite a bit of pressure , holding the tip tight would be the hard part.
Not much else but to drill and try tapping for a pullout.
The other option I see is that hole that the plunger is stuck in is cast all the way to the back side, just not drilled through. A person could drill from the end to get a 4mm punch in and once out, tap the hole for a pipe plug.
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