Thanks for your suggestions!
I checked Galloping major and did not find much but I made some other findings:
-Warlord has Delawere, Sauk and Fox with shirts.
-Northstar has some packs with shirts in their Muskets and Tomahawks range
-Brigade games - King Philips War - 3 packs woth shirts
-Crusader has woodland indians with shirts but the hairstyle is not compatible with the Arikara featured in the movie (they look more like Sioux)
- The Foundry Blackfoot are really good but unfortunately not so many action poses
I find head conversions tricky since the hair is usually long and fixed to the torso. I have OG Seminoles with loose heads but theu have turbans which are not compatible with the Northern tribes. Anyone found suitable heads elsewhere?