In the three small local tournament trails I participate in, i have not seen a single metal clasp cull tag. Plastic clamp style yes.
However, I have seen people that still weight their fish in a boat, pushing the metal hook through the membrane under the lower jaw or inside the gill plate. A plastic clamp style is ideal hear as well.
A would welcome a year-round season on Bass (all species actually). Allow fishing for, but put closed harvest seasons in if that protects vulnerable populations.