My suggestions is, stop buying SACD disc, multi-channel or not. I wish I had given up much earlier and would have save a lot of money and space. My house is still full of VHS, 8mm tapes even Hi8s, CDs DVD-A, SACDs that I don't remember was the last time I used them. Tapes are 99% gone and discs will soon (2-5 years?) be abandoned too. Even for those who really believes disc "sound better", they would eventually abandon them in favor of digital.
For now, yes it one really likes MCH SACDs, it is much more difficult to find a good substitute on the digital side as there aren't too many 5.1/7.1 DSD files available and players, such as Pansonic's (I suppose some Sony too, you would think) and multichannel DACs/streamers are not in plentiful supply and/or are relatively expensive.
Eventually, hopefully soon, all SACD titles will be available in DSD files. Most recent AVRs can handle those now using network or USB input, but typically offer questionable support/capability in their playback.