How about a "proclivity"?
I've always seen this as a personal preference that doesn't necessarily connote a sexual desire, an emotional attachment, or a physical need. In my observation, my ABDL tendencies often gravitate from one end of the spectrum to the other depending on my overall state of mind, sense of self-awareness, external social factors, and level of focus (e.g., adult responsibilities/priorities superseding "little time").
A "proclivity" implies little more than a preference for "something" without the baggage implicit to labels like "condition," "kink," "compulsion" or similar ilk. It's also generic enough to remove any sexual or emotional overtones that make certain people bristle.
That said: it's still nothing more than a euphemism. "Happy", "glad", "peachy-keen" -- they're all just semantic variations of the same theme. I doubt there will ever be a "one size fits all" label that every ABDL or IC can endorse without debate.