will most likely be either a DIY project or a custom job by a woodworker. since you control cover will be made from wood, and wood will require you to have a thicker cover than one made from plastic or metal, you'll most likely need to deepen the cavity lip where it mounts to accommodate the added thickness
you have the control cavity cover plate you need a duplicate made from? if you, you should be able to find someone locally who is good with a
- thickness sander to fine tune the thickness and flatness of the new coverplate
- bandsaw to rough cut the new coverplate
- router table to use the original as a pattern to duplicate the new coverplate in wood
with the cost of the wood and shop time, you're probably looking at around $100 to have someone make this for you
all the best,
R