The thing is with Universal, they're far from scared to try new ride technologies and experiences with IPs that you wouldn't expect them to (looks at Kong and even Jimmy Fallon). I feel some sort of trackless dark ride that represents visiting Newt's menagerie could be brilliant - seeing all the different beasts and even throwing in the peril of a chance encounter with Grindelwald/the Obscurus would work brilliantly and would be incredibly well received. To me, the only difficultly is relaying the difference in timing of the Harry Potter/Forbidden Beasts areas, especially as they have a crossover with certain characters (Nagini), but to be fair, if you're looking into it that much, you need to reevaluate what's important in life.