She doesn't seem like the type of girl Ash would actually marry. As random as it may seem, Giselle would be a way better choice since she complements Ash's personality her being a trainer aiming for the League as well. Misty is too tsundere>Goh, Koharu
Too fillerish as characters. Frankly I don't like either of them that much. Brock, Dawn or Serena would unironically be more interesting.
Also May x Drew is pretty much canon (as canon as a relationship can even be in the context of the ashnime)
But yeah, it's a good idea