I’d go with the 218. Digital into that from the 568. Din to SpeakerLink cross over cable between the two for control and analogue out of the 218 into your amp. I’ve got a similar set up, just got to plumb in the comms. I’ll be doing it in a week or so when I get home. I can let you know how it goes. MQA from the 218 directly into my old tag McLaren mono’s and Ruark floor standers sounds great. You’ll have the best part of two and a half grand to spend on other stuff.

HT: 861v8 - ID41, HD621, DSP5500hc, DSP5000 front, DSP3100 S&R, REL t9 SW.
Office: Fanless 7i5 w/ ROCK, 218, Woo Audio WA2, Focal Utopia HP’s
Family Room. Grandinote Volta, Grandinote Shinai
Bedrooms: Allo digi, 3100C, Prime HP amp & PS
BBQ/Party: Raspberry Pi, Explorer 2