No room to weld anything on it? No room to super glue either? Old fashioned nail puller with counter weight (bearing puller type) won’t grab it? You got the nut off? But no room there to give it a good bang. Would a pry bar (adjusted to the space available) work? Is there room to get the drill with drill bit on top and drill the head off? Grind the head off and push it back?
Can you work around it until there is room to get to it? (Take off other parts first?)
For swearing go Dutch grin we have a unlimited selection, just end every sentence with "godverdomme" and use it instead of the F-word grin combined with "gotverdorie" it will break any bad spell. More here when needed.
Good luck
Richard