Aw. Well done, Creed!
If you are keeping him on leash for now, would it not be possible to walk him outside the enclosures, so he can greet the other dogs through the fence that way?
My local dog park also has a separate enclosure for "small, senior, and disabled" dogs. I take Shelby in the big dog area though. At 13-years-old, she definitely qualifies as a senior. And she does not run anymore, or appreciate being jumped on--which I assume is why older dogs are allowed in the small dog area. But if the worst thing that happens in the dog park is some big puppy slamming into her, we'll be fine. Shelby just gives one warning bark, and the puppies accept her dominance and back off. A small dog that is intimidated by a larger dog though can be very aggressive. Shelby has some small-breed dog friends who do just fine with her. Even one neighbour pup who is very timid and whose human thought her dog did not do well with larger dogs made friends with Shelby. But there are others who snap and snarl and bark incessantly and strain at the end of their leash when we walk past. We definitely keep our distance from them!
Where we used to live--well, there wasn't a DOLRA in that town, but in the closest town that did have one--there was only one enclosure for everyone. But there were a lot of calls to get a corner of it sectioned off for the small dogs. I think the idea of separating them is becoming more popular here.