Oh man was this a drag, took forever to do, but it's worth it! I bought a 3/16" VERY long drill bit, which was just thin enough to fit in the stalk. I put the stalk in a vice, and very slowly drilled through, stopping every few seconds to clean it out and make sure it was straight.
It's impossible to see in the photos, but theres a tiny bit near the bottom where the drill poked through the surface, but a little Bondo and RNB hid it perfectly. That, and it doesn't show through the earcap.
It's more than thick enough for two wires, but since the post is aluminum I will just run one wire straight to the battery, and the other will be connected to the post. On the mounting piece of the earcap, I will make a little plate which connects to the battery. The end result will be exactly like a switch, so no need for a mercury or tilt switch! And of all that needs to go in the RF top is the LEDs, so I'll be able to use a more accurate top I'll post more when I get the other pieces done.