If you treat it like a big deal that's negatively affecting your life, so will they. If you treat it like an asset, so will they.
As for me, I've actively sought relationships within the community first. I want to hold out for someone who enjoys their kinks/quirks and mine vs. the partner that just accepts/tolerates them.
Much to my mistake, I would Google reactions to people discovering ABDL online or read YouTube comment sections. This is a horrible idea and made me keep my mouth shut about it for a long time, unnecessarily.
People in groups can be huge bullies when it comes to being an ABDL, but when rationale and understanding dialogues are to be had, nobody in their right mind will kick hate out in your direction.
There is a cracked article and in the comment section, absolutely no one threw stones, in fact, most were reflecting on their own infantile behaviors such as action figure collections or their love for the smell of baby powder or a round of the inevitable "all men still breastfeed" jokes.
In retrospect, this is honestly a behavioral pattern that all biological beings across the board partake in, and it is neither harmful to yourself or others.
I am reasonably open about my ABDL lifestyle. Anyone who shares a room with me or borrows my phone or rummages through my dresser drawer is bound to discover something and my logic is I'd rather introduce them to the truth before they assume I'm up to something illegal. My close friends and roommates all know. My vanilla partners all knew. The reaction has been universally positive. Oddly enough, the only other people that expressed undesirable concern were of an archaic mindset and had tradional toxic racist or sexist ideologies. So that is an interesting nugget of knowledge.
Just know that this is nothing to be ashamed of and I wager your partner will feel the same way. There is no magic script or angle of approach that will entice them to participate, however.