Look for professional mistress, escorts or sex workers that provide an AB/DL service.
adultwork (dot) com springs to mind as a place to start.
Obviously any interactions with or post covid are a risk.
The other thing to do is find local ABDL community and make friends. Instead of looking for a kink dispencer.
You might find willing friends and/or a couple or a Mommy willing to entertain you. But - with that I'd also say you're looking at attending events, getting to know people, being sociable over a longer period of time which may not be possible for him.
If you want the best experience I'd say arrange to make that trip to an ABDL nursery. Make the trip along with something else or two on the bucketlist.