Hmmm, MSKen,
Im not sure about this but i think you got it slightly wrong. I got Vent/jelly/conitecs script working very nice with my geforce2mobile. But i only have one skin on my model but this skin is a 32 Bit tga. And that alpha controls the shinyness.

And also, i dont think this is a shader, it´s an effect. Shaders wont work with such old hogs as geforce 2 so i guess they should be impossible on TNTs also.
But effects may, since there is no "graphics assembler" involved.