You cannot compensate caster & camber on the opposite side to correct a problem on the damaged side. You wil most likely cause a tire wear problem(camber only). With the ecentric adjustment bolts it's unlikely you could change caster that much without adversely affecting the camber.
The car really needs to be pulled. Any "problem solver" is not intended to correct such issues as a bent frame. I'd hate to spend the money on adjustable arms etc. & then find out I still fell short of the intended corrected angle & have to pull it anyway. If the car is worth anything $500 is not much to spend to have it right.
How about tracking the woman down who hit him & getting her to pay toward it?