Are they not triploid, or did I pick that up incorrectly somewhere?
I think your regular daylilies should be safe from cross-pollenation for the most part.
People actually spend a long time trying to cross-pollenate with them for their immortal superpowers.
Edited to add: Wikipedia to the rescue:
"Both diploid and triploid forms occur in the wild, but most cultivated plants are triploids which rarely produce seeds and primarily reproduce vegetatively by stolons.[5] At least four botanical varieties are recognized, including the typical triploid var. fulva, the diploid, long-flowered var. angustifolia (syn.: var. longituba), the triploid var. Flore Pleno, which has petaloid stamens, and the evergreen var. aurantiaca.[5]"
https://en.wikipedia.org/wiki/...
