The idea of "let us know what kits you want converted" got me intrigued...
I pulled up a list of 2e kits
here. I ignored the world-specific ones and only focused on the PHBR and DMGR ones. Let's take a quick look.
First, A LOT of them exist as either backgrounds or have been handled by other subclasses. Secondly, the racial ones were often redundant with the class ones as far as flavor goes, and there were a lot of repeats save only for class (peasant fighter, peasant priest, peasant druid...). So what is left?
Complete Fighter's Handbook: There might be design room for Gladiator (I know its an alt background already) and samurai, and that's it. Everything else is covered by the Barbarian class or by the Noble/Folk Hero/Soldier/Outlander backgrounds.
Complete Priest's Handbook: Pacifist Priest and Prophet Priest are the only uniques in the bunch; as backgrounds soak up 90% of them and the Monk class exists to totally outshine the figthting monk. Perhaps a Monkish/Shugenja Domain might have room.
Complete Wizard's Handbook: Witch is pretty much redundant with the Warlock flavor-wise, but there might be some design space for a traditional "potions, hexes, and charms" witch. Besides that, Wu Jen for an elementalist/alternative caster is pretty solid.
Complete Thief's Handbook: None? Swashbuckler and Assassin are the only real "alternative" thieves, and they're done. Everything else is a background (Charlatan, Pirate, Spy) or barely worth a background (cutpurse and fence).
Complete Bard's Handbook: I'd love to see Gypsy-Bard for my Ravenloft game, but I can wager its probably a no-go (or a background as best). Everything else seems to be doable already.
Complete Paladin's Handbook: Inquisitor, Ghosthunter, and Skyrider all have some potential.
Complete Ranger's Handbook: Feralan was fun for a "raised by wolves" ranger, and Greenwood Ranger's "power of trees" might be cool. Oh, and a REAL Beastmaster would be nice. ;-)
Complete Druid's Handbook: Again, 90% of these are backgrounds. Hivemaster (Bug-based) and Lost Druid (a fallen druid who wages war on civilization) would both be cool and doable.
Complete Book of Dwarves: None again. Almost everything here is a background or covered by another subclass.
Complete Book of Gnomes & Halflings: See Dwarves.
Complete Book of Elves: With Bladesinger done (and done well) the rest of the kits are fairly redundant. Maybe Undead Slayer or Archer (as if archery needs more power).
Complete Book of Humanoids: Inferior versions of regular class kits. Shaman is the only concept I want out this book, and not in any fashion CBoH handled it. The races, on the other hand, they can convert those!
Complete Ninja's Handbook: There is nothing here that isn't being done by the Rogue or Monk classes currently.
Complete Barbarian's Handbook: Wizard Slayer might be a fun guy to convert.
Complete Necromancer's Handbook: A subclass for a subclass? Nothing seems interesting, perhaps Anatomist as a Doctor/Surgeon Background...
So ignoring the four they already did, perhaps we have a few worth doing. If it were up to me: Path of the Wizard Slayer, Pacifist Domain, Circle of the Lost, Oath of the Inquisitor, Oath of the Ghosthunter, Greenwood Archetype, and the Witch Tradition are perhaps the best bets, with Samurai, Wu jen, and Fighting-Monk/Shugenja or some Kara-Tur book later.