I personally think the GB and Perry offerings are far more on the nail historically than the Fireforge mini's.
Just my opinion of course- I'm not trying to influence you otherwise.
I really can't think of any plastics that are on offer- I reckon it would be possible to kitbash some. You would need European helms (normal soldiery, [not noble] men at arms), medium westernised armours and of course bows, quivers and a spear or two.
I did a Google search for kitbashed/converted Turcopoles and couldn't find anything. Mind, my "Google Foo" has been way off of late so- I would give it a go yourself
