So...I was finally organizing the jillion daylily pics on my phone, sorting by cultivar then by date.
In the process, I got a gander at this pic of Dallas Star:
Then I checked out my other pics of DS. The overall flower shape is very similar to my peachy-pink NOID. They both have raised midribs. DS also has twin longitudinal creases on the sepals, just like my NOID:
Can this type of characteristic pass from parent plant to offspring? If so, it may be that my NOID is a DS offspring. This could've been self-pollenization, or even crossing with one of my parents' other daylilies, like Frans Hals.
Whatever the case, my peachy-pink NOID has "seedling" written all over it, so I can stop trying to ID it!