Ben, there is an ad hoc approach that theoretically should work. A MobiOne Cordova/PhoneGap app is a packaged webapp consists of:
1) the web implementation of the app UI and logic (html, css, js, images, …)
2) the cordova runtime container (webview, bootstrap logic, js-native bridge, …)
note: I have not tried this yet (its on my todo list).
The idea is to use an existing ios app as a template that you replace the app contents (#1 above) with that of your new project. How this would work is to:
1) set up a simple XCode cordova project, e.g., a hello world app. Get the build process working and verify this app will work on an ios device or in the simulator
2) create a simple ios app (eg., template.ipa file) using appcenter to serve as the template.
3) replace the contents of the Xcode project with the key files from the template.ipa file. The .ipa file can be opened with a zip utility for this step.
4) build-test-debug, repeat until your app works.
Note – I would use the latest MobiOne 2.5 milestone-2 configured to use Cordova 2.9.
At some point we hope to support the new Cordova 3 CLI but that is a ways off.