Repousse with higher guage meta

Hello all

I’ve just completed a repousse cuff that I worked on 18 guage silver.
I’m relatively happy with it, but were I to make it again, I’d like
it to have a bit more weight and so i’m curious to know what people’s
experience is with working higher guage metal in this fashion. I know
that I’ve seen native american jewelry that seems to be 12 guage and
repousse, but I’m wary of how much brute strength this might require!
Alternatively, might it make sense to use argentium 12 guage? would
it be softer? too soft? Any suggestions would be very welcome!