would it be possible to wire my aria strat style guitar so that the middle pup was always on about "3" on its tone knob...but that tone knob could then be used to do tone for the bridge pup

bit confusin dunno how to say better

ty in advance
You could try splicing a capacitor of the right value between the middle pickup and the switch, then you just run the wires from the brige pickup to the tone pot (you should be able to follow the old wires from the middle pickup).

If you google strat wiring diagrams I'm sure you could find one that shows how the bridge could be hooked in to the tone, you just have to experiment with the right capacitor for the right tone for the middle pickup (about 3/4 of the value of the existing one on the pot).