I can't recommend the Eitr highly enough. I moved from Curious/W4S Recovery USB decrappification setup - adding the Eitr changed everything for me, and most others who've bought one. My bet is you'd be letting your Regen go pretty quickly.
Is it worth adding a Schiit Audio Eitr?
I've got an Aurender N100H running to a Schiit Audio Gumby (Gen 2 USB, not the Gen 5) via a Curious Cable and the ISO REGEN powered by the Ultracap LPS-1. I truly enjoy the soundstage provided by this setup, but I still have a bit more noise than I had when I was using a digital input via digital coax. Would the Schiit Eitr help to lower the noise floor further. Does it make sense to add it to the signal path?