I can’t advise you on the ORCA side, but Ableton does not do well with external clock masters and you’ll run into strange cases with record sync and playback issues from time to time that, in the end, are very frustrating. I tried for a long time to use a Beatstep Pro as a master clock for it, and after much consultation with Ableton engineers and Arturia folks, we concluded that it wasn’t going to work well no matter what we tried. And I’ve written MIDI software in a variety of languages so I’m quite familiar with it at a technical level.
My Analog RYTM works a little better, but there are issues with the workflow that get clunky. My advice: keep Ableton as the clock master. Do check what kind of sync you’re sending ORCA though, and ignore any sync coming back from it - turn the sync off on the ORCA input to Live.