You could let make some aluminum wheels by Imagewheels. No cheap but good quality. Several Morgans, like the 4/4 80th anniversary or the ARP4 have Imagewheels. They would make them to your measurements including a center piece to match your centre lock mounting. The best would be to send one of your whells to them, if you have a spare.
No relationship with Imagewheels, just an interested spectator.
