Is there a Neutral Power wire buried in the back of the electrical box, the WS467s are in? A white wire with a black indicator on it is not a Neutral if it is connected to the WS467 now.
The switches that do not steal power through the load. Need the neutral power wire to work.
There is a way with Insteon parts but no reason you may not be able to do it with X10 modules.
In the switch loop case and Insteon. You have to do some rewiring. You change the wires in the switch loop to be Line and Neutral. Then power a Insteon Switch with the load capped off. Add a module inside the fixture and control it with the switch.
You maybe able to use an X10 wall controller. Sending X10 commands to a fixture module inside the light.
Since Smartlabs has removed X10 support from all their latest designs and some older models with later firmware. Using a Insteon module like a Micromodule and adding an X10 address may no longer work.