It doesn't matter whether Wilkinson sells Coddington wheels or not. Will he sell you 4 center caps, on the understanding that if they don't fit your wheels, he'll take them back?
You could also take your center caps to a machine shop and have them machine the dome off, leaving a flat surface to glue a logo to.
Wilkinson used to have a retired machinist make his wheels for him. The guy had a CNC milling machine in his garage. He would then take the centers and hoops to a welder to have them put together.
Also, further to what Ron wrote above; it's my understanding, the second version of the Pantera East wheels were machined from a forged billet. These wheels still had stepped rims, the correct center bore and used the OEM logos and retainers. The third and final version is not a Pantera East wheel, it's a Coddington wheel. It does not use a stepped rim, it does not have the Pantera center bore size and uses the domed Coddington center caps.