As stated, let it soak a bit if you have the time. I'd get a good pilot hole established in the center with an automatic punch and a small drill bit, then use a left-handed drill bit. I bet it would spin right out.
There's a little bit of space, so as long as you're reasonably quick on the trigger, you shouldn't mangle the hex in the pin.
I agree this is a design doomed to fail... I've been lucky so far, but some have been a real pain. I always reinstall with plenty of anti-seize.
2002 Suzuki DL1000 V-Strom, Dark Metallic Space Blue
1983 Suzuki GS850G, Cosmic Blue
2005 KLR685, Aztec Red - Turd II.2, the ReReTurdening