I want to introduce an archetype which enables characters to expand their proficiency level with armor/weapons and keep up with those provided by their class. I also wanted to make the champion and fighter archetypes dedication feats more worth it for martial. So I homebrewed some things which I am considering allowing in an upcoming game.
Basic ideas
Champion Dedication now grants a lesser champions reaction instead of armor training. Added a level 20 feat diverse armor master which does what you would expect; requires master proficiency in one armor and expands it to all armors.
Fighter Dedication now grants a lesser attack of opportunity instead of weapon training. Lowered diverse weapon expert to level 6 (still requires expert in at least one weapon) so that now rogues can use it to expand their weapon options to make a slayer-ish rogue. Introduced diverse weapon master as a level 14 feat for the same purpose, requires master proficiency in some weapon.
Martial Archetype. A simple archetype which can be used to add armor/weapon proficiency and HP. Casters can use this to get basic martial competency. non-casters can use this to expand their weapon proficiency or their armor proficiency without dedicating themselves to a deity.