You need to find out what the code is that is turning on the SSS light. It could be something as simple as a broken air hose. When I worked at the Cadillac dealer I replaced a few steering wheel position sensors.
Any experience actually doing the conversion definitely will take a look at the actual system to see if I can source where the leak is though. Just seems that the conversion may be the route to go to eliminate the headache factor. Plus would love to do it myself and have that one time knock out fix
Check out strutmaster.com this was the site that had me pretty convinced to go ahead and spend $700 for the 4 wheel changeout. My biggest concern is loosing that caddy ride and getting a more firm sport suspension.