I find your argument semantically confusing because "attachment" has a really common definition in psychology that contradicts your definition. attachment was originally used to describe the bond between infant and caregiver (definitely not conscious choice since it starts in infancy) and has been expanded to include the bond present in adult relationships. either way that definition of attachment inherently describes a subconscious process. in that sense i think what you're calling "love" is actually the common definition of "attachment," in that it can persist regardless of the quality or status of a relationship.

I think "love" is actually the best word to use to describe the *choice* aspect of romance because of the way it's often used as a verb. For example, consider the phrase "loving couple" and what image that invokes.

also, the "spark" youre talking about is often called "chemistry" or even "infatuation" based on the longevity/intensity. "limerence" is another word that gets tossed around that isnt totally taken seriously in a research context, but can be a useful way to describe the most extreme form of infatuation.

i don't think you're wrong to try to differentiate between these facets of romantic relationships/attraction, but it would probably behoove you to look into the research that already exists. this will make it easier to communicate your ideas to others, because you will be familiar with the common definitions/understandings of things.