Well..... you get half your wish... sort of. No P/E, but, "Iron Bottom Sound" has patterns for the Portsmouth holes. You just stick them on, then drill, and cut out, the holes.
In some ways, it's more work, but it's available now. And, they're included, when you order for a conning tower. For Silversides you'll need to replace the kit conning tower, anyhow.
Mike K.