Hi, don’t have any suggestions on 1 and 3. But why not option 2?

I don’t see why this would be any issue. I have the apple tv 4k with infuse software it decodes the DTS-MA and HD-MA tracks.

I store my movies on a QNAP NAS have the share mapped up in Infuse, it detects all the movies and displays a nice movie wall, and had no problems with different formats.

NAS -> AppleTV -> HD621 -> TV + Meridian.

G61RSL, HD621, Dune Smart H1, Oppo BDP-83, 8000, 7200HC, 5200, 4x Reviver, QNAP 809, F80