I am using the LIO DHT as just a preamp. I thought the same as you at first but reading about it during the release of the DHT module, I was willing to give it a try, as it read as if it was going to hit on everything I was after... it does in spades. I love it! I've owned many (more than a handful) integrateds and preamps. The LIO, even just as a preamp does it for me.
Like you, I love my amp and my DAC but the off the grid aspect is pulling me in. I will be adding the LIO DAC 2.0 module for a try when it's ready.