That's not a bad idea. I'm not quite sure how I feel about it. I've liked the idea of alternating weeks. However, I acknowledge that I don't have a good feel for what 'Mechs are "popular" (so I've been going based on TRO and general availability). And we will run out of Clan 'Mechs before we run out of Inner Sphere 'Mechs anyway.
For other weeks, we can pair up (or more!) Clan 'Mechs, and do the same with the Inner Sphere once we're out of TRO 3025.
How does this sound?
7/15 (Mixed): Shadow Hawk and Shadow Hawk IIC
7/29 (Special): Aerospace Fighters
8/12 (Mixed): Thunderbolt and Thunderbolt IIC
8/26 (Clan): Vixen (Incubus) and Incubus II
9/9 (Inner Sphere): Griffin
9/23 (Clan): (Invading Clans, Ghost Bear Edition) Grizzly, Kodiak, and Kodiak II
10/7 (Inner Sphere): Ostscout and Ostsol
10/21 (Clan): (Invading Clans, Smoke Jaguar Editon) Arctic Cheetah (Hankyu) and Ebon Jaguar (Cauldron-Born)
11/4 (Inner Sphere): Locust
11/18 (Clan): (Invading Clans, Diamond Shark Editon) Thresher and Piranha
12/2 (Inner Sphere): BattleMaster
12/16 (Clan): (Invading Clans, Steel Viper Editon) Battle Cobra and Crossbow
12/30 (Special): WarShips and JumpShips