Today I made a little workflow to control my WeMo Switch, so I thought I'd share it.
You'll just have to enter your WeMo's IP address into the "Filter Script" block, and into the lower "Run Script" block if you also wish to use keyboard hotkeys.
It currently supports only one device. I’d love to add support for multiple ones, but I only own one WeMo so it’d be very hard for me to develop the workflow without being able to test it.
If you have any questions, feel free to ask.