A solution that works with ship odels is to use threaded rod inserted into sutable tubing.
The tubing can then support a sutiable washer to keep the tube from cutting in.
If your wiring is simple, just red/black +/- type stuff, you can bring the wires to one each of the threaded rods, and finish up the circuits under the base.
Now, if you need more wiring, you will likely want a larger tube. Threaded rod comes in quite small diameters and can be your friend.
It is possible to find brass unions which you could solder into suitable tubing to render a chased thread. But, those can be ellusive, too.