I don't know how skilled you are... but if it were me, I'd slot the head with a small dremel bit and whack at it with an impact driver.  apply penetrating oil from the back side.

I'm not very skilled, I'm learning as I go on this bike, and I don't have many tools. No impact wrench, just have ur basic drill, socket wrench, an an angle grinder. I'm not seeing a plausible way of getting this thing out and I don't wanna damage the thread and be forced to buy new forks! I guess I'll call some shops and see what they can do, cuz while I don't need a tire today I'll need one very soon and need to "fix" this mess. I don't get it, I used a good Allen wrench, sprayed Wd-40, tapped it with the hammer and twisted then it just started slipping and stripped the bolt. Was it my fault?