I spent so much time trying to get the russian imax version and when I did, it was 2.39:1. I think they removed the imax edition.
It can be found floating around the internet. You’re looking for torrents with IMAX in the title.
I say go for it! I’m all for preserving whatever expanded aspect ratio footage of this movie we can get, since Disney has made it clear they aren’t prioritizing releasing the proper AR for a film shot specifically for the format.
Eh, while the IMAX version is cool, it was more of a marketing device than the actual intended ratio. The movie was framed for 2.39:1 and was filmed in such a way as to make it IMAX-safe.
I do love the IMAX version, though.