Stripped Sway Bar

I am trying to remove the sway bar from the front right strut, which to do you need to turn the bolt with a wrench while holding an allen key to it. The problem is the allen key hole is stripped and will not turn as the bolt is pretty rusted to the screw. I am able to get the bolt turning freely but will not come out as I need to hold an allen key to it. Is there any other way to remove the sway bar? My only solution now is to just order another sway bar, which I want to avoid.