Strange, I never had a issue with Auro, rip like any normal disc, one pass thru MakeMKV to decrypt and make the backup file, one pass thru DVD AE. Just select the right DTS file and rip. I can play back the file in Linux using Strawberry or Win 10 using Foobar (wasapi event into my marantz thru the onboard nVidia sound/video HDMI card). You then just have to manually select Auro3D and if you look at Status you'll see it's recognizing and playing AURO, Sig. AURO/PCM FORMAT: AURO 9.1 , Same as playing the disc on the BD player. Appears any player that can deliver the file bit perfect to the AVR will be fineAtmos is way easier to deal with than Auro-3D because it's readily auto-recognized as is DTS:X in the Marantz receiver. Auro-3D often defaults to DTS + Neural X or something instead (depends on the saved setting). Auro-3D discs generally have two sets of DTS files too which is kind of annoying (usually the 2nd set).
Now to Atmos, to clerify, you mean use MakeMKV to create the backup file, and then rip the TrueHD 7.1 tracks with DVD AE?for MakeMKV, just rip TrueHD 7.1 tracks with Atmos.
What is the purpose of the Shield device, that one loses me if you can delievr the file bit perfect to the AVR?