This is what I had in mind:
http://dnd5e.wikidot.com/feat:ritual-caster
Mind you that there are several mod sets and arcanes (augur set, motus set, arcane primary exhilarate etc) that do not require to be equipped on your frame and none the less affect directly its defenses / shields / energy and so on and so forth.
A load out consists of a primary, a secondary and a melee, and we hardly need to use 2 of them to kill lvl 800 enemies. With so much firepower I don't mind sacrificing 1 weapon-mod for an augment mod.