I added a 200DR to my Superuniti, and it gave a nice uplift in sound quality, but to my ears, nowhere near enough to justify the £2k price, and I suspect you might find the same. I bought it as the first stage on an upgrade to separates, otherwise I wouldn’t have bothered. Try to get a demo, if the price is right you might still like what it does.
Remember that the DR spec only applies to the preamp PSU in the 200, which you would not be using, so an older non-DR 200 might fit the bill.