You can try hammering in a suitable 6 point allen socket, then try unscrewing it. Sometimes grinding the rounded end off of the torx allow deeper seating and bite - always a good idea to try this.
And hammer the bit in , first.
They may have Locktite on the threads. Big heat can help.
If it is messed up already, you have nothing to lose.
I sympathize with simple things turning into heck.
Take a step back - pretty much all things are fixable.