Thanks @dabassgoesboomboom I don’t think it makes sense for me to buy an RME dac just for this purpose as it’s still pretty expensive. And I need a 2nd UP for my office setup if all this works as expected.
Since I now need to get the Up Gateway before I can move the Bluesound I guess that will take at least a few days to a week best case. And it appears that once I get this working I can replicate it in my office setup using a 2nd Up Gateway for direct iPad AM playback. I will say for @jussi_laako benefit that it would be nice if this was a supported ‘feature’ of HQP & NAA so a custom script wasn’t required. Optional web page on NAA OS where this could be configured and then web stack disabled for example?