Well the question is, what do you plan to do with a wheel that does not have bearings? Unless you don't plan on it turning often, and you are not concerned with efficiency, I suggest getting more bearings. Andy Mark has quite a few
hubs that will interface directly with their wheels.
In my humble opinion you really should buy more bearings, at the very least you should machine
Delrin. Press fit it into where the bearing would fit in the wheel, with a .375 id.