Have you considered an Apple TV? Optical out straight into the 568. Plus all the other benefits of apps for Netflix etc on the unit. Anything in iTunes can be streamed through it including tv shows and photos.

I use one and find it acceptable. I do also store my music in the highest quality I can (or so I believe with apple lossless I think it is) it works vey well for me

Also price wise it's not a lot more to buy than a good dock.

Kind regards
David

G65, 210, HD621, DSP5200.2, DSP3300C, DSP3200,

NUC 7i5 Roon Core, Apple TV 4K, Blustream SW41AB-V2, Panasonic TX55fx802, EE8 switch

Multiroom - Ms200, Nile’s ZR4
Bedroom - 251