I've used flag bearers from the HaT command set with these figures and have also used the SHQ standard bearers with the HaT Peninsular War British figures before their command set was released. I think all look quite good together (But I use them for wargaming, not dioramas).
I like your work on these figures, too, BTW! Though from a pedants point of view, light troops should have the shoulder wings as well as the green shako tuft, not that anyone's counting