good to hear you. I had no luck too with your hybrid seeds. The Y. gloriosa seeds gave me around 7 seedlings. Actually it looks like Yuccas aren't interessting enough anymore. Also the german forums are less visited.
That's sad as these plants are still the main plants in my garden and I'm looking for some new hardy hybrids but nothing is available.
Had some success with the flowering Yuccas I had but most fruits are damaged and contain only a few ripe seeds. If they are viable?
Will look into here frequently, hope this forum refreshes.