I was thinking about this VR concept and other, non-broomstick related ways it could be incorporated into Wizarding World Vol. 3 as a “ride.” This is just spitballing conceptually, but:
Let’s say we’re invited to the Ministry of Magic, perhaps for some kind of magical showcase as part of the story*, and one of the new “magical inventions” is a headset/pair of goggles that would allow us to see thestrals without having to have “seen death,” which is the only way people in-universe are able to see them. (Hand waving away the fact those of us IRL who have seen death would see the thestrals the moment we walk in the room, but whatever.)
We walk into a room with “floating” saddles, using whatever trickery would be used to pull off floating brooms in that idea, mount the saddles, and when we put these magical headsets on (the VR rig), we’re suddenly able to see that we’re actually riding on the back of a thestral, itself now clear as day.
Through story trickery, we end up flying on the thestral through whatever events unfold within the “ride,” while being able to hold on to the saddle handles for security, and would explain why the thestrals “disappear” again the moment we take off our VR rigs.
* - As for said story, you could really plug it in anywhere. If Universal just wants to tell an original adventure, boom. If Universal wants to tie it to a Potter-related event, it could be tangentially related to the trio’s Ministry trip in Deathly Hallows (though it wouldn’t make sense that we muggles would be invited there at that point) or as simple as having Arthur be the one to invite us to the Ministry. If Universal wants to tie it to Fantastic Beasts, then they could make it that Newt is showcasing a bunch of beasts to the Ministry, and as we’re seeing his thestrals, the other beasts get loose and we have to fly around helping him wrangle them as they spread out across London (or whichever city they go with).
Just an alternative idea to it being a broomstick experience while also offering up an in-story/universe explanation as to why we’d have to wear headsets.