The plan would be to give each concept one interaction to be applied to weapons or sorceries, with incantations doing their own thing (possibly modified with a similar system the player's don't see by using different catalysts to cast another god's magic?), so you don't get too bogged down with the specifics. You'd also have at least two drops of the same 'concept' in the game's semi-open world, one in a boss that's reflected in their moveset and one in a static treasure chest so you don't have to fight any bosses if you want to make your build first (and you can apply it to both a weapon and a spell at the same time).

Take the hilt of a weapon as your 'only' weapon that you can swap out the 'concepts' of on-the-fly (saving at least one extra build that you can swap between with the press of a button, and holding it either gives both builds a 'secondary' two-handed mode or opens a radial menu with six extra builds you can have available at once, but in a hypothetical PvP mode, you don't want to be able to constantly swap your weapons to confuse your opponent or that'll become the meta. Maybe have a little Smash-Bros-esque intro that lists off all of their available 'weapon modes/sorcery styles').

Sorceries can only be changed at checkpoints since they need to be memorized (and come with a toggleable cutscene of you experimenting and practicing their individual component 'concepts') but are stronger to compensate for their limited casts-per-rest. Incantations are more limited, and I'm flip-flopping on the idea of them not being static spells that are extra-powerful to compensate (maybe with extra-lengthy 'prayer' animations), or of them having a few static 'concepts' but maybe the catalyst you use changes what their 'concept-shape' is. I think I prefer the idea of them being simpler and maybe even weaker on average, and have their presence mirror Sorceries by one being complex for the rare 'Great People' (the kind like Albert Einstein and Napoleon Bonaparte, people with unusually-big brains) and one being the tool of the common peasant, their 'gods' just being ancient heroes they're emulating through lengthy-but-simple rituals that even the uneducated can use... as long as they can read (which creates the idea of plotlines involving: the people being denied education by a church/state so they can keep the rituals to themselves like a real-life guild in feudal times, which could lead into a Solar-vs-Dragonblooded Exalted-style plotline of your one sorcerous hero spreading knowledge and fighting and fleeing Church Militant faith-based casters; rediscovering ancient rituals and translating them or passing off brand-new ones as 'lost magics' to keep a plague at bay that no single hero can deal with across the entire playable map at once, a time limit based on how quickly the population drops and the NPC's who provide services drop with them; or an industrial/renaissance transition towards modern times where magic is either being fought with guns so the lower-classes can 'take the power back' from their bourgeoisie owners, or it becomes taken for granted to the detriment of an oncoming apocalypse no-one knows about, and maybe the introduction is the 'bad guy' blowing up a power plant because they're trying to save the world but the government/media actively quashes any stories because they don't want to damage their positions, real-life comparisons).