FWIW - I feed an redbook CD signal upsampled to 96kHZ by an outboard processor and it works fine.

Also, SACD is far from dead.
A significant number of jazz & classical titles continue to be released. No pop, but I don't really care as most of it is so heavily compressed.
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990/Oppo BDP-83SE/Toshiba A3/Emotiva XPA-3/B&K ST-1430-II/Gallo Ref 3.1/Gallo Reference AV-Center/Gallo A'DIVAti(3)Rear/ MIT Term 2&4 Cable/Mitsubishi WD65C9//Monster HTS-1000.