I brought this up to some others, and we all think it can’t be done, and by that it’s broken because it should be a thing that was missed in the original code as a requirement.
Working on an issue as we speak, I’ll post it here so you all can add new info and/or thumb it up.
Conditions work because of the condition structure, the structure is different here so need a structure tweak or something else that people smarter than me will have to figure out.
Here is the issue…
Trigger selector: cannot add one from selector if one already exists in the blueprint · Issue #19050 · home-assistant/frontend · GitHub.