When I put Deavers up front on my truck I left the swaybar off and noticed no difference. Even with a few inches of lift up front (truck still had a slight rake, the old springs were sagged and gull-winged), I noticed no bad effects. Even coming off the freeway on curved off ramps at speed, it was very stable and never gave me worry. I really wish a did the crossover steering, it should be a huge improvement for you. I'd ditch the swaybar and install the steering and see what you think. You can always whip something up later. Worst case scenario, you'll like the crossover much more than you'll miss the swaybar.
In comparison, my 2011 with coil springs up front and big Kings, even with the swaybar on, will roll more. With the swaybar off the new truck is a boat and I can roll the truck over its axis by turning the wheel and still keep it going straight down the road hehe