The part of the kit that would improve the handling is the tower. By raising the outer end of the upper link, it get's rid of the weirdness at the bottom of the travel where the wheel will tilt back and forth some with no vertical movement. The front shock in that setup is mounted to the factory mounts. You could just get rid of the back shocks and replace the front ones. You would just need the bolts after the plates are removed assuming the threads are still there. The Works shocks come with new lower bolts. If the upper shock bolt currently in it is 1/2" then you could add heims to the upper end of G-series for the FL350R and they would fit with 1/2" bolts. Find the thread by Factory45 where he did just that. Off the top of my head, they are 15 1/4" long, not 12".
I have put a spacer under the stock tower with longer bolts before to get the same handling benefit. The problem it does cause is the link to bind on the frame on the inside at full compression.