I was just thinking that it's mildly annoying for so few models to be able to order vehicles, and then I remembered that sentinels are considered Platoon and squadron. So my idea is to make two leaders, one for scouts and one for Armored. These models could bridge the gap kinda. Maybe the scout model can order squadron and the Armored model can order Platoon. I think letting them order both would be optimistic.

Then let them attach to their respective sentinel squad. Maybe the scout leader could give the unit Assult keywords on their weapons, or maybe something like "If this unit made a normal move it counts as remaining stationary". The Armored leader could Maybe give the squad devastating wounds, or maybe hit rerolls against vehicles and monsters.

Lmk if these would be fun models.