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I was thinking that it shouldn't be too hard to DIY. Just install a switch to disable engaging the 4wd but allow engaging the low side of the transfer case. It is all electrically controlled.
So, leave your hubs unlocked and put it in 4low. Done.
With ESOF, IF it still works, put a toggle switch inline on your vacuum pump so you can disable the auto hubs.
This has been around a while, check guzzles site, maybe it's in there. I have it on my truck.
You need the vacuum for other thing (HVAC operation), so you have to put the switch in the power to the diverted valve for the hubs, not the pump.
Somebody had pictures on here a while back, but I don't remember who it was.