My dream is to meet a woman that REALLY is into WAM. Not someone that I need to introduce this amazing fetish to, but someone that loves to get messy as much as me! Am I being too optimistic here?
A lot of people coast through life not really knowing what they enjoy because they haven't tried much, that's especially true when it comes to sexual play and fetish.
Holding out for a woman who's at the same level as you and is open to sharing something with you is.. hopeful. Meeting a woman who doesn't yet know she loves it and is able to get to the same level as you over time and is open to being introduced to it by you is.. more realistic (and builds a stronger connection too!).
They definitely exist but you'll likely end up frustrating yourself and will miss out on some great partners by holding on to this desire. It's also likely to be off putting to make a fetish your top criteria when trying to meet someone.
Your best bet is to find someone that is playful and sex positive. Many people with the right mindset will likely enjoy WAM. It is a pretty damn fun fetish to play around with for someone willing to let go and not take things too seriously. And maybe in exchange, they'll introduce something of their own to you that you'll love as well.