Just wearing the helm grants its wearer +1/-1 meaning most weenie tokens instantly get you two fresh cards from your deck
So even though the way these different products exist within the lore of the game is very similar (they dont), theyre not a part of the same branch of Magic
The deck is built around tokens so theres plenty of included synergies, but theres also the plentiful tokenmaking found in the Commander format itself
The most useful thing to use O'aka for is to either remove lore counters from Sagas, keeping them from finishing and sacrificing themselves, or removing finality counters
In this color alone there is Austere Command, Azorius Charm, Boros Charm, Lorehold Command and loads more
While there may be enough easter eggs and references to keep diehard fans happy (or annoyed because their faves haven't been included), for the most part, it can all be ignored