I think the easiest and best way they'd bring Illuminations is to go all out on Despicable Me and Minions. They already have the the land built out from Beijing, including restaurants, shops, and attractions. I'd imagine one flat ride, one kiddie coaster, one walkthrough, and hopefully one dark ride (eg SLoP style ride).
I'd prefer to leave Sing in Japan. From what I've heard and seen, it's just not a strong enough attraction for an American audience, but goes over well in Japan (and I assume Beijing). Instead they could bring the rumored Villain-Con walkthrough, which would also keep the land more cohesive.
Despicable Me is one of Universals biggest IPs, and is fairly well represented in other Universal parks. If EU is getting Illuminations, then DE should get it's own land.