I actually kind of like the idea of realising that Willow will always love Tara more than her, but deciding she wants to be with Willow anyway...

Mm, I can definitely see that 'cause Kennedy seems like a pragmatic sort. She's by no means whom I personally ship with Willow post-NFA, but I think she would accept that Willow's never-ending love for Tara wouldn't detract or belittle the love she has for Kennedy.