I just had a possible brain storm....fart or whatever. Stick a pair of these under the front tires.
1000 Lb. Capacity Vehicle Dollies 2 Pc
You could do the alignment without ever having to jack it up. The only thing they would affect is the caster angle. It would exaggerate the caster just a little since you're raising the front end, but not the rear. So your caster would "appear" a little higher than it really is. I bet it would work.
