It's not a bad idea, Bob. Not up to us though. I'll mention it to Chris though.
I hope Chris likes the idea. If you guys make it easy for me to use Mongoose Conan rules with your adventures and supplements,
I'll buy everything you publish. I won't need the main rulebook, since I won't be playing 2d20. But, if there are Mongoose Conan conversion books for everything else, supplements, adventures, what-not, I'll buy it. Because, I can use it in my game.
Misfit Studios prints three excellent supplements for use with Mongoose's Conan game, and they are 100% compatible. I'm sure they do this only using the open Wizard's license (and they don't mention "Conan" in these books but instead call it OGL Barbarian.
Note that the booklets have Mongoose Conan specific stats (stuff not seen in a normal d20 OGL book), like Base Parry and Base Dodge bonuses for character classes, complete Conan stats for shields, combat maneuvers, and the like.
If they can do that, I'm sure you can make specific conversion booklets akin to the one Thulsa made for his adventure anthology for no cost, just using the open license. Plus, you guys have the right to use the name "Conan" and talk about other aspects of the Hyborian Age.
The Barbaric Warrior
Barbaric Treasures
The Barbaric Sorcerer
The "Conan" Crowd
I'd definitely do one for the Mongoose Conan RPG.
But, also think about doing one for
Zeb's Fantasy Roleplaying System - ZeFRS. It's the old TSR system used in their original Conan game. I'm sure that will be free to use.
Other Conversion Booklets
Do one for Savage Worlds, since you said that you get a lot of requests for it. Here's a fan made Savage Worlds supplement for Conan:
The Savage Sword of Conan.
Do one for Pathfinder. Free and lots of players. Plus, if you do one for Mongoose Conan, this one is pretty much done anyway.
Do one for 3.5E D&D. Free and lots of players. If you do Mongoose Conan, this one will just take a little more work, and its done.
You might also consider
Doing one for other swords & sorcery type games, if the license is cheap/free.
Babarians of Lemuria anyone?
Astonishing Swordsmen & Sorcerers of Hyperborea?
This way, you spread your net wide for the largest number of Conan/Swords & Sorcery players out there. Make the supplements and adventures useful for anyone who plays in the genre, regardless of the rule system they are using.
Maybe you'll pick up some 2d20 converts along the way.