Looks like we'll just use the sleeve. I did call etrailer and nope, the 2.5" is limited because there's little demand. Thought about contacting Curt or Reese directly, but who knows what it might cost to get one custom. Maybe they'd say "Sure!" but I sort of doubt it.
I haven't lifted the truck. It's a stock Ram 2500 4x4 CCSB. The top of hitch to ground is 26" and the top of our TT hitch is 17" when level. At it's lowest position, a 9.5" drop from a shank that's 13" overall tall, the top of the ball is still a little over 20.5". I ordered the new drop last night. Once I get it set up I'll have to cut off some excess to keep from scraping the road.