I know KrawlTex out in Cedar Park is easily capable of doing it. They do good work but they have questionable business practices and always under quote time and price. I have had some issues with them in the past on other builds and no longer give them my business because of it. Sad because they really are the best down there.
The 4Wheel Parts in Plano does the perch adjustment so I don't see why the one down there can't. They are higher than most shops, quoted me $180 for the perch and $135 for the alignment, $315 total. Most shops up here in Dallas are at $250 total.
I would check with Jeep Masters. They recently moved to South Congress across from St. Edwards University. I think there is still a shop out in Cedar Park called Atomic 4x4, they have been ok in the past too. Both of these shops have experience with Fox and King shocks, I've had them work on mine on previous rigs in the past, so they know what they are doing.
Hope this helps.
Tejas