This thread is your best bet. It’s what I referenced years ago to set mine up. Although right now it’s not working for me. I’m having the same issue as the original poster in this thread.
I was able to re-publish the device handler for the ZRTSII to get it to populate when re-adding. However, the device handlers for the shades themselves still don’t work when including the virtual nodes from the ZRTSII. I get a “success” message, but then nothing ever pops up in SmartThings.