Stumbled upon something else last week called
MANY AGEShttps://www.wargamevault.com/product/429814/Many-AgesThis looks fairly simple, in a good way, but still manages to have a substantial list of weapons and armour types with various modifiers. Building a warband couldn't be simpler, as you simply choose your troop type (infantry/archer/cavalry) and load them up with the appropriate gear.
No real provision for monsters or special races (at this stage), but the author has produced some free supplements that add some additional content, such as spellcasters.
This is the ruleset I'm now planning to use for
my 54mm project, as it ticks all the boxes of what I want.