Some good suggestions, and yes a real holy grail!
I bought a few at the time, but they were 3 or 4 times the price of minifigs, my money didn't stretch that far.

There is a Garrison pose that works quite well, Minifigs horses at a real pinch. I also want to check out Ral Partha, Essex and Irregular as not sure if they class as small or "regular" 28s.