Wow.. wow.. wow..! I downloaded the trial for the new Adobe Animate CC. Not only does it fully support HTML5, but it is fast. I took my HTML5 test project, uploaded it to CocoonJS and it spat out an Android APK app at full landscape resolution. It runs just fine at full frame rate.
In other words.. this is going to save me a lot of time. I can now create HTML5 web apps quickly, with the easy option to deploy to the mobile app stores.
It simply works.