Compatibility question regarding a Chord 2Qute and a PS Audio Perfectwave Transport

After much deliberation I've decided on a 2Qute DAC and have located a used one in good shape.
My transport is a PS Audio Perfectwave memory player. I didn't think much about the compatibility of these two units until just now, when I'm about to buy the 2Qute.
....Here's the issue:
The PS Audio transport output options are (in order of quality according to the company), I2S, S/PDIF via balanced XLR, Coax via RCA and the optical.
The 2Qute's inputs options are: USB, BNC Coax and TOSLink optical.

Here's my question: From my reading it seems the 2Qute does much better with a USB input (the only input that's galvanically isolated).  Some go so far as to say if they had to use only the coax input on the 2Qute, they wouldn't want this DAC.
While separately the PS Audio transport and 2Qute are great, combining them forces you to use the coax connections which, on both units, are sub optimal.
....So you have two units that are pretty decent on their own and them combine them and have to use the least SQ optimal output/input.
Am I looking at this correctly?
Is this combination self defeating?
Kind of bummed as I was getting myself pretty sold on the 2Qute.
Thanks.
--My speakers, amp and preamp are Magnepan 1.7's, Butler TDB 2250 and a Modwright.