That looks like an easy conversion technique, but why not streamline the wiring by replicating a Reviver breakout box, like this you would have a single RJ45 cable going to the preamp? I think Lundhal make a suitable transformer that is quite small.
I wanted to do this to integrate this at first for mating my 861 to my DS5200 but I prefer the clean look in my living room.
I will be relegating the 861 to a second system/room as I am having built a pair of DIY speaker with some newer class D amps, that sound glorious!
I want to put another Raspberry streamer inside the case of the 861 hehe!