if u were going XY, then you may as well go to XF, cheaper, parts more readily avail. and lighter
tie rod end is not a problem, just get the larger ones from bursons etc..
i believe there is however a difference in the spindle height geometry which may cause bump steer? ShaunP knows all, but apparently they must be heated and bent in a ceratin area to accomodate for this, then magnafluxed to ensure integrity