Not sure what you are asking. Wood plugs - brass plugs. Do you mean spout plugs or base plugs?
If you are talking about spout plugs, stay with wood. The fancy valves, brass spouts, etc. in all liklihood would not have been seen.
Not aware of any horns with a brass base plug. Brass finials mounted in a wood baseplug are by and large a modern thing with not too much of that happening back in the day.
Now, on the other hand, a moneyed person might have had the urge for something unique and rare, and he could have afforded it. But not so much the average guy. Play it safe and don't get too carried away.
John