From what I’ve heard (cannot confirm) is that the UHD release on vudu has the IMAX sequences intact.
UHD of the theatrical cut, I presume? (which is interesting too because VUDU UHD is the only place with the theatrical cut in 4K. The 4K disc release is extended cut only - and we know that’s fixed 2.40:1).
If true, this would certainly be a great help. Interesting if that version has varying aspect ratios or just the fixed 16:9 broadcast version.