Digital XLR AEX to COAX?

I envision connecting my Ayre DX-5 DSD to a KEF LS60 via a Digital AES XLR cable from the Ayre to the LS60 COAX input.  The LS60 eARC will be connected to an 85" Sony, --  I'm not sure a switch from eARC to HDMI would work.  Any advice would be appreciated.