I am recently going through the same transformation from pure digital, home theatre set up, to vinyl with tube phono and preamp. I use same power amp and speakers. There is no reason why you cannot find a preamp that can house all your digital and analog gear together. Usually, a full functional preamp is alway sonically more superior. A used ARC Ref1 or Ref2 plus a phone amp will be perfect for this purpose.
My experience is that you will end up buying more than what you intially plan to spend. You really need to think about your need and listening habit to make the right choice to start.