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Welp, the process has begun.
I found after some research that the GM Sniper on P-Bandai is not only basically just the Ground GM, but also effectively has the same weapons and accessories as the old 2001 MG (minus a basic beam rifle). So that not only takes care of the sniper weapon for the team (though I'll probably put the rifle on a different MS), but also gives me a shoulder-fired missile launcher that I can put on the heavy artillery team member.
The G-Line Light is basically just an excuse to not get shafted by the $10 shipping on a single kit, but I figure that since it's a Federation MS from 0081, it'll be roughly the same tech level as the GM Sniper and GM Spartan, plus I like how beefy its beam rifle looks. I already got the Narrative-B, Altron and RG RX-78-2 2.0 weapons set from previous orders, so the only other option to buy was the Desultor, which theoretically looks similar to GMs but not close enough for my tastes.
So now I just need to find a good vendor for a bootleg GM Spartan, and then pick one more GM-style kit from the 0079-0083 era to round out my four-man squad. I'm kind of leaning towards the GM Cannon II since it's big and beefy-looking with big guns. The Origin/MSD GM with the shoulder missile pods has more accessories (I really like its beam rifle and I think I still need a bazooka), but it looks a bit plain. I guess I have a decent amount more planning that I need to do.