I feel your pain mate
Been thru the same on the Project Driver. Rounded off a caliper bolt, tried drilling it out with no joy, so, had to change the front hub,
to get the hub nut off i had the car back on the wheels, but no caliper fitted, handbrake on, and all i could spin the front wheel

so in the end i rigged up an axlestand , short extension bar and a breaker bar, , then SAT on the front wing whilst pushing down on the wheel with one foot, and pushing down on the breaker bar with the other.
Apparently , according to my kids, I have great balance, right up until the nut finally gave up and undid, with one hell of a crack.

good luck with whatever route you take.
