So, the main thing I'm concerned with here is the timing of introducing this character. It might be able to work if the romance was a small thing and Malon was always one of the gang, because then she could just be there when you meet the gang initially. However, this changes many of the details of your character.
Also, although I don't believe it's official yet, we are also seeming to lean towards the farm of Niek's design, which doesn't really include Talon, but rather a hard-working dude who just can't do it all himself. It's pretty awkward to separate Malon and Talon, and they work together as characters (even though MM did it. I thought it as kind of awkward there.).
So, what I'd recommend (and this is just me speaking, and I, unlike Star, am not the law
), is maybe working both Malon and Talon in elsewhere in town, unrelated to the gang.