I think there is a bit of confusion here. Audirvana is not a DLNA/UPnP server like JRiver is. It can just stream using UPnP to te compatible media renderers. That’s a different operational mode.
The PCM rate your DAC supports is not directly related to the DSD rate using DoP it can support or supports. It’s implementation question. It’s true that the DoP consumes double the bandwidth when compared to the Native DSD, but the bandwidth here is not the problem.
DSD256 is crazy high resolution, it takes a serious high-end DAC and accompanying equipment to really benefit from this. If you think you’ll be able to fully appreciate DSD256 using the low to midrange DAC (even less using multimedia receiver), you’re fooling yourself.