Hi Jeremy and thanks for your question.
We don't have the resources to look into SAC, and what you've written about Mackie Protocol is correct. However, I'd be delighted to assist you in your investigation of SAC, so we can figure out a course forward. That course MIGHT include having to implement something (or a lot of things) on the MIDI Designer side, but the investigation should be pretty straightforward.
If you're interested, get in touch (via config->actions->email) with any questions.
Thanks for your interest and your question.
Best!
Dan
P.S. You can use Lite just as well as Pro for any investigation. Same same.