If you let @trompetin17 cook we will have Atlas in the game, so the whole UI will be moddable I won't spoil unless he wants to so i'll let him post screens.
Carthaginiam elite mercenary Gaul cavalry uses a variety of helmets that are too late for Punic Wars.
I'd suggest adding the same Montefortino helmets as the advanced mercenary Gaul cavalry (with elite version being distinguished by mail armor).
Also i have noticed some of the Alesia helmets are made of bronze, my understanding is those were only made in iron.
This is certainly a workaround. But I believe we might need a slightly revised Atlas GUI at some point. Would Vibe-Coding be acceptable at all? (I am not a software developer). I'd give it a try using Claude Opus 5 on an isolated branch privately and see what can be achieved.