Okay, if you're just looking for people to pitch things, here's one idea taking the Flashmen as the starting point of a lance. Go SLDF-themed with an Excalibur for distance sniping with the Gauss rifle and a Starslayer to add something that can jump and provide a bit of crit-seeking. If you'd rather stay on the ground, use a Crab. Either way, that gives you a 5/8 lance that can move and fight together but still a bit of variety.
The Excalibur and Starslayer were reintroduced in the 3050s by the Lyran half of the FedCom (the Flashman is built on Tharkad, the Lyran capital) and the Crab has always had a few knocking about, so they're not hard to justify in modern games, especially if you're running mercs, Steiner, Davion, or ComStar/Word units. There was some trade with the DC and FWL at different points, too, along with salvage, and none of these BattleMechs are super-rare, so you can probably squeeze something out even farther afield if you wanted to.
For less pure SLDF and more FedCom, try an Enfield, Enforcer, or Falconer.