This isn’t an exact answer to your question, but looking at your use-case have you looked into Unreal’s Gameplay Ability System? There’s a bit of a learning curve, but it provides a ton of functionality for exactly this kind of thing (arbitrary player stats, stats that have complex interactions, replicating the results of applying modifiers to actors, etc)
My understanding is that Epic use it on Fortnite, which to me is a pretty good indication that it scales well performance-wise, given their player counts.
I thought I’d at least mention it, as it’s one of those systems that’s very powerful, but you could very easily miss if you don’t watch the Unreal livestreams.