I can respect the not having the means to hire more people to create exporters. But can you at least shed more light on your plans for Appmobi and if you will it will benefit people looking to create mobile games?
The accelerated canvas is supposedly a way to get around html5 and the native browser limits.
Also if you don't have time for exporters, the EXE one might be easier than you think. Awesomium is free for indies making less than a certain amount, and I am sure that fits most users here.
Could you not find a way to export Awesomium exes, since you do not have to update the export when you release new html5 changes because its a browser that runs the code it will be easy once you have it working, it should be set and forget with no more updates for the exporter.