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The 1080p BR is encoded in h264 and you can use FFmpeg to convert it to an mp4 that Premiere can open with the command “ffmpeg -i inputfile.mkv -c:v copy outputfile.mp4”.
This won’t work so well for the 4K BR for two reasons: firstly, it’s h265 (10 bit) encoded, and secondly it’s in HDR. Tonemapping HDR down to SDR yourself is quite the headache - I must confess I tend to use someone else’s SDR tonemapped version of the film (available… elsewhere) instead. I usually then use FFmpeg to convert said SDR tonemapped 4K footage to DNxHR HQX for editing according to the details laid out here. You can also use fairly recent Handbrake versions (maybe only nightlies?) to convert h265 footage to lossless h264 for editing - set the quality slider to 0, level and things to auto, and make sure the resolution is set to 3840x2160 with no anamorphism or cropping - but this produces even bigger files. 4K video generally always gets even more huge as soon as you take it to any codec besides h265.
Of course, as demonstrated in Movies Remastered’s post above, the tone mapped 4K SDR footage isn’t quite identical to the 1080p footage because it’s essentially a different grade of the movie. I use Dre’s colour match tool to match the 4K footage to the 1080p footage if necessary.
FFmpeg isn’t so scary once you’ve used it a few times. It’s pretty difficult to screw anything up with your computer - mistyped commands almost always quickly throw an error message (fail fast!).
Edit: sorry, totally off-topic page king.