Note that 2.0.12 added a bunch of new ICS subscription options for events, including Outlook, Apple iCal, etc. In each case all it's doing is setting specific options to remove content that isn't supported by that device.
You could create a calendar child theme, implement a call to the PhoneGap API to give back the relevant details for a calendar feed (implemented as a twig filter, you can do this in functions.php), then call that through the twig filter.
It's not simple, but it will work.
Notes:
The one advantage is that the subscribe button twig code in 2.0.12 is now all in the one place in twig/subscribe-buttons.twig in the child calendar theme (you will need to copy the original from the vortex theme).
I've not needed to do this, so I can't say for sure how it would work, but that seems like the logical way from what I know of how Ai1ec hangs together.