Quite quickly came up with the solution to my problem after sleeping on it, and I’m feeling all the sillier for it. The search term wasn’t the problem, I should still be able to find at least the “Save Game Mode” node, and the variable itself was fine for that purpose.
Stupidly though, I was trying to do this search inside a Function - just another relic of my previous architecture. Presumably, all those didn’t register inside the function because you cannot have time-related notes (such as delay) inside a function. To my credit at least, this is a UX problem with Unreal. There should be some kind of indication as to why you can’t in the first place.
Kudos for the prompt response though!