That's fine.
I was just thinking it would be the easiest, reversible way other than the lead tape to add 10g to this head.
Some of my thoughts were;
Measuring out 10g of plumber's solder is pretty easy. And it likely would not fill the whole cavity, allowing for aesthetic adjustments.
The medallions could also be painted.
The medallions also wouldn't affect performance negatively.
If my reference of the driver I weighted to a full pound scared you off, I apologize. I only included it as a reference to the most extreme of my many headstrong experiments.
The loss in performance I got when I weighted a driver to one pound was because the driver head went from 201g to 454g. This would be similar to taping a 5 iron head to the driver and swinging it. I remember putting it on My swing weight scale and it flipped the carriage of the base. Distance loss was due to my swing speed dropped 30 mph.
My most successful driver for me was when I used the same method to create caps to fit over the weight screws of an r5 dual to bring the head weight to 220g. I guess I should have led with that anecdote instead of the pounder.