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Hi @mihayne51,
Welcome to the Sony Community! I have a few questions or tips that might help us find a solution together. Just first make sure you are on the M29.R.0476 revision firmware for the DN860.
Keep us posted.
Dutchice
Just to clarify a misunderstanding perhaps. You have read the specs correctly, but that refers to 2 channels of uncompressed linear PCM streams. In other words, you can not send for example 6 channels of uncompressed audio (the lossless formats that you are after) through the ARC link. But compressed audio formats will surely be passed through by your TV over the ARC link. The only thing that you will be required to do is to select those audio tracks (Dolby Digital AC3 or DTS) from the disc menu before starting to playback your movies.
As you probably have explored yourself, there are various ways on how to solve your problem. It always comes down to what you find most favourable. I believe the 3 options I suggested will all solve your problem. You could also opt to disable HDMI Control in the AMP menu, that would resolve all the wrong automatic input switching all together.
But unless you have true high quality speakers designed for Hi-Res audio you will not be able to distinguish between compressed and lossless audio formats. Only an audiophile could and even then, not with 100% accuracy. So most probably option 1 is the most convenient option for you. At least until you upgrade to an HDR certified AMP of course.