I understand your concern... I bumped into a similar situation a few years ago when I hatched a special pastel cross a few years ago.. the dark mother was named "Espresso" and the cross I simply called "Espresso x Pastel". I'm trying to line breed this year... so we'll see what the super is!

Looks like you've got a great plan setup. As for butter x het red, I don't think it's been done yet. However, Corey Woods has produced quite a few lesser x het reds I believe... they look similar to your butter x cajun crosses in my opinion (which ain't worth much lol!)

Good luck!
Bristen.