So, I know I'm incredibly late to this discussion, but had a thought after building a potential conversion for a tactician character for one of my players.
With regards to Field Arsenal, to the extent it does feel like there might be a waste when features overlap, I tried to find a feature that splits the difference in terms of providing a benefit without making it too complicated.
The result was a short list of features in the vein of the caster prayer/blessing - with the stipulation that in order to qualify for one, you need 2 kits with matching stats.
The design principles are, if you pick kits that are suitably different, then those bonuses are baked in. However, if you choose kits that are very similar, you can focus on ONE stat of those kits to push them just a little bit farther.
Without further ado:
https://docs.google.com/document/d/1Ci2xk9spPw_TwyRmEKs2RKuG5PZ4oyBg5icOGIFGCuA/edit?usp=sharing
Tactician The tactician gains the following feature at 1st level. Blended Technique Your training has granted you superior skill with even the simplest of weapons. You can choose one of the following techniques. You can change your technique along with it as a respite activity. Aegis Your ri...