My kid, who is a terrible degenerate clanner, runs hell's horses as their main. Thus, they have a neverending thirst for things with treads and wheels instead of good solid stompy legs like Kerensky intended. Ironwind metals are a little fragile for an eleven year old (paint chipping etc) so I've been looking for stands in for a while.
As long as you're willing to either proxy the hell out of things or make your own stats, reaper CAV vehicles are a good option. The system is 10mm scale, and the mechs themselves mostly (though not universally) look a bit huge, but the vehicles are generally pretty okay looking next to catalyst mechs. The heavy vehicles are a bit huge, but work well for the assault-size vehicles that we get in BT.
Thought I'd toss this out for folks, and as soon as I learn how, I'll send pictures.
I just bought a bunch of these from Reaper and have been painting them. They’re handy in a pinch. I also recommend.
Edit: I bought one aero fighter though and it’s huge and won’t take primer well for some reason. Might still work but not quite as good a solution.
Also, I’m going to try out their infantry too. Will update as I can.
Here's the infantry I got. Already pasted with baking soda to bases, but just FYI...