Couple of things to address here. First of all, only light duty 3/4T 2WD 6-lug rotors will retrofit on your stock spindles. 4WDs are completely different as are the HD 3/4T 6-lug rotors. In fact, most HD rotors are 8-lug, so you wont have to worry about that.
Second. The shifter that comes with the Kiesler kit is reported to be junk. But I have seen pictures of aftermarket shifters adapted to this forward location by elongating the bolt holes a bit. That being said, most of us are still going to have to deal with the long shifter stick which negates the advantage of the aftermarket shifter. It occurred to me, (having a mv3500 in my 93 with a Hurst shifter), that the Hurst shifter for my 5-speed has a much taller tower to facilitate a shorter throw with the long stick. If the shift ball at the bottom-that goes into the trans-is the same size-or even close-the the T-56s ball size, a simple plate adapter could be fabbed up to fit the two together. Im almost positive the this would make for very short throws with a long stick. And no seat interference either.