For true faffability...

One could connect the Eversolo both via the coax to the speaker's D1 and via the AES/EBU through the 518 to the speaker's D2.

That way, one could easily compare the two signal paths after configuring Roon/TIDAL/whatever accordingly to 44.1/48 and see which you prefer as you fine-tune the filters.

But Nick is probably correct - KIS