Bottom fork pinch bolt rounded.

[Detonation]

So my fork seals arrived,
Started laying all the tools out I need to change them, measured all the tools against the bolts to make sure I had them all right,
Then noticed one of the pinch bolts to remove the wheel axel is rounded off, the right one came out fine but the left one nearest the wheel has nothing left for the Allen key to grip, I can't get a hack saw or grinder on it to cut a slit on it and don't have a dremel.

I really don't want to drill it out,
I'm going to try to grab a reverse drill bit and try than on it to see if it undoes it but I've not got great hopes for that.
Anyone else got any ideas?