I don't plan on more lift. I'm running 6" now with long arms in the front and it works great.
I might consider an off-road sway bar or something with your setup?
I've had my Chev D60 {69" wms-wms seems to be the accepted width?} with the following track widths:
H1 wheels and 38 x 12.50 SX--76.5-77" sidewall/sidewall
H2 wheels and 37 x 13.50 Toyo MT--82.5" sidewall/sidewall (it'd BARELY fit on my trailer that's 83" from fender/fender)
Dodge Ram wheels and 37 x 12.50 Creepy Crawlers--78-79" (never measured, but I'm sure it was around there considering how often I hit my drive slugs compared to the H1 setup)
Hutchinson beadlocks and 37 x 12.50 Creepy Crawlers-- 81"
I believe the "full width" D44 and 10 bolt fronts are not quite as wide (67") as the Chev 60, so you could make things fit under the XJ with some huge flares (assuming you want to be street legal in UT).
So, you can keep the tires under the rig more than you'd expect with offset wheels. If I was trying to do what it seems like you're trying to do, I'd research the hell out of a non-disco Dodge front 60 or other unit bearing axle and hang it from something with a frame (or check out RockMonkey's XJ build thread). I believe that would be a good solution in a lot of ways.
If I ever built another XJ, I'd stick to the non-disco D30 and 8.25 and keep the tire size under 33". Personally, I'd have a hard time "upgrading" to a D44 front as the axle joint is what I broke on my D30 and it's the same part on the D44. IF I did, I'd look at the Waggy front/rear matched set and stick to 35-36" tires with 6" or less lift.