I have Perry metal for the Sudan and should have been an ideal customer to buy half a dozen boxes of plastic Mahdists and I would have done if I'd liked them. I just thought they weren't that good. Many had an odd forward leaning pose and the arm/shoulder joints looked tricky to pull off convincingly.
I still think the the Tex-Mex would be an ideal Perry project.
As noted above I think Naps and HYW are most likely for the next plastic boxes.