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Not worth it at all. Too many folks converting from the ESOF set up back to manual hubs. I replaced my hubs last fall with Mile Marker stainless manual hubs.
You'd also need a GEM to control the vacuum solenoid, and the switch in the dash, AND - the GEM won't engage the hubs until the transfer case is engaged, so you'd have to fool it into thinking it was, etc. etc.
I just had the WARN premiums installed last spring and they are great. My local 4X4 shop installed them for $50 because I bought from them. I did price shop and all the prices I found were the same so for $50 I said go for it.
I have the Mile Marker stainless hubs and they worked beautifully here in NW this past winter, and it was a brutal winter.....
Install them yourself...it only takes 5 minutes a side...