Have you considered a Lumagen processor to handling the switching? I considered going down the HD Fury path for a while before eventually adding a Lumagen 2143 which routes the audio to the HD621.
The added benefit is the video processing which is really stellar- if my wife remarked immediately how much better the picture looked through the Lumagen.
Theater: 861v4_LPS, 818v3, HD621, Oppo 203, Lumagen Pro, DSP8000SE, DSP5500C, SW1600x2, DSP5500, Epson 6040UB, PS4
Living room: 861v4_LPS, HD621, DSP8000SE, DSP5200C, Oppo 203, Lumagen 2143, 818v3, Sooloos/MC600 Bluesound Node
Bedroom: M80
office: G68D, DSP6000
Garage: DSP5000
Storage: M33s, DSP33s, DSP5k, 501, 518, M1500, G98DH, SW1600
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