Dismounted Horse Troopers (?)

I'm toying with the idea of modelling dismounted horse. Not dragoons, troopers from horse regiments dismounted for action in siege lines or on a raid/attack on garrisons and supplies.

For a dismounted regiment of horse (9 figs in size) I was thinking of having one figure mounted with a pistol, one dismounted holding a horse, plus one officer and 6 troopers on foot.

At the moment there are no commercially avaliable figures that fit the bill, looks like major conversion jobs will be required. Figure hacking, arm swapping and remodelling with green stuff sounds like a lot of fun. I think I need to identify some figures to start from and try out conversions.