Yes that’s right – there is a similar setting in Logic Pro X, but it seems a bit flakey for reliable sync. It seems as though the only way would be to de-embed the audio from the SDI outs, and then re-embed to XLR so that is going to get pricey. The best way is to either; use Ultrastudio 4K and stop doing 5.1 for client previews on a video monitor, or buy a new thunderbolt 2/3 I/O and use Protools.
Co-owner at Pollen Studio
http://www.pollenstudio.co.uk