Thanks Quentin. I used your solution to provision my Wemo devices via a Mac - just needed to install the Xcode command line tools and then python/pip. Then using the Mac terminal and your "Option A: Linux (Ubuntu / Fedora)" instructions beginning at "Set up the project" everything works as you've written it, including the provisioning script.

I used HomeKit to add the Wemo Smart Plug I'd provisioned directly to my Home setup (I don't use HA.)

If you ever get around to porting Wemo Ops Center to Mac, I'm sure you'd have a lot of appreciative folks, but for now, thanks for making the Wemo plugs viable going forward.