I think it would have to be tinted rubber... If you did the gauntlets in the right base color then did topical weathering it could be cool.
Mixing the pigments would be a pain, and really expensive trial and error. I know Smoothon has their "silpig" line for tinting silicone... maybe something like that?
I like the idea, but I think it would be Reaaaaaallly hard to pull off and cost a ton.