I wouldn't make that same leap. As you mentioned BTMRR is only linked to S.E.A in DL and MK, not the rest the Parks around the world. So why would you assume that this would be any different? In fact we know from the update made by Disney themselves that this backstory update only applies to DL and MK, not the rest of the JCs around the world.Once again, I probably misinterpreted what you said: "We aren't talking about entire parks like you mention, but rather individual attractions within the Parks that would be connected together via Easter eggs."
It's not a huge leap to assume that if S.E.A is going to be connected with one Jungle Cruise in one park, it would also need to be linked to all the other Jungle Cruises. Per that website, both Big Thunder Mountain Railroads have the same S.E.A connection in DL and MK. Though surprisingly, there is no mention of anything relating to the Big Thunder's in Tokyo or Paris.
As we shared earlier this year, we are building on the original story of the Jungle Cruise at Disneyland park and Magic Kingdom Park. We’re adding more humor, wildlife and skipper heart to the classic attraction, and as part of a much larger
So I think you're jumping to conclusions here.