What’s the likelihood of Amazon Alexa support too ?
Within the near future? Close to zero, unfortunately.
Have a look at https://github.com/kservices/gBridge/issues/27, I’ve explained the problem quite detailed there.
Long story short: Getting your service verified on the Alexa platform is fairly expensive. I’d need to do some crowdfunding (that is most likely going to fail…) to get this process done without any losses.