I just wanted to post back my findings in case anyone else is interested.
I Just upgraded to Jriver MC 22 for Mac (not sure if this was in previous versions) and indeed one can add additional DLNA zones (I have a new Sony TV and old WDTV live box) and I activated DSP studio and set convert streaming to 16 bit no header (MP3 also worked) and told each sample rate 48k and above to sample to 48k (44.1 no change). I enabled the new sample rate converter .
i can now play my entire collection of high res and SACD files on the TV and WDTV box. There is some delay on sacd before each track begins, but I can probably set buffer to 2 seconds to help this.
My my goal was to try and get this working so I can buy some small but high quality speakers for other rooms .
I don’t know of other server software like Roon can do this but jriver now feels like a complete system that plays on everything from the DS/bridge2 to basic systems for background music .
Now I’m off to find a single wireless speaker that sounds good.