I believe that an iPhone or decent android smart phone would fit the bill otherwise there may be a few rather expensive “audiophile” all-in-ones. But most of those are integrated amps with perhaps a decent headphone jack.
I do vaguely keep track but there are so many hardware releases happening that I thought one might have slipped me by.
I use a Pi, spdif converter, naim unitiqute at the moment as the qute also drives my office speakers.
But it doesn’t really grip my HD 650s so I am in ponder mode…
(now wearing snowshoes on my asymmetrical isolation feet)
I just ordered a Topping DX3Pro for my HD650’s, but it doesn’t have the network connection you want.