I have a 4th gen as well, and have always been interested in using struts and losing the upper arms. I don’t see why you couldn’t keep the lower control arm. The easiest way that I could think of would be to somehow use a mustang spindle/strut on the original style lower arm. Not sure if the ball joint is compatible or what would have to happen at the top side of the strut. Would love to hear if anybody has made it work.