No way.
The picture indicates 2 things:
The pin was sheared off squeezing it over to one side in the hole. It looks to me that the bolt wasn't tight enough to hold the pulley and it worked on the pin for a while.
And, enough of an oil-leak is showing to prevent rusting the pin, I think.
Machining a new set-up at 180 degrees cannot be done in situ and is way too involved and costly.
I think the dremel-center-indent, a center punch and some hammering might get it loose. It's worth a try before any major surgery.
__________________
1980 Carrerarized SC with SS 3.2, LSD & Extras. SOLD!
1995 seafoam-green 993 C2, LSD, Sport seats.

Abstract Darwin Ipso Facto: "Life is evolutionary random and has no meaning as evidenced by 7 Billion paranoid talking monkeys with super-inflated egos and matching vanity worshipping illusionary Gods and Saviors ".