So, following your feedback. Infantry sections will still stat with 4 man, i'm ok with that.
Now if we let them stat with 1 weapon slot, then anvil will add the 2nd slot and give them survivability upgrade like armour/RA to become ober equivalent, and, hammer add 5th man and change their only bren to elite bren profile - aka fire on the move, the 5th model will use a sten or Thompson.
What's about that ?
One could try an anvil/hammer upgrade for T0 that replaces weapon unlock. Now instead of brens, Anvil gets Vickers -K and the cover mechanism that provides a bonus in cover and penalty out of cover.
Bren can be redesign to be more like BAR and I guess one could allow 2 weapon slots.
Non upgrade Enfield should be redesigning to be more like K98 and cost IS could go down 260. Bolster could be limited only to hammer.
Tanks could see similar changes with valentine (redesigning as mini Churchill)/Cromwell and maybe Tulip/17p options in T4.
The idea is to separate the upgrades thus creating more tools for balancing and more choices for the player play-style.