I don't think I've seen anyone suggest this exact thing; why not have type modifier overrides available as a gear item, either linked to artifacts or as a separate slot? Wouldn't it work to just let us load mags with charged ammunition into our guns to get an element, temporary or otherwise? You could pull out your ghost and push a certain button to telemetry the Light-charged ammo into your next reload, maybe make it an infinite use on a timer. It would also be interesting to have it for all weapon slots; if your shotgun isn't working against the rare mob with a non-matching shield you could slot in a few rounds that worked and take it out.