Is there a strategy or solution for converting one to the other?
The most extensive work will be the UI.
About code itself, if you have placed the logic out of the controls, you can force use of the New framework on Desktop with
At the beginning of methods, and Desktop will use all new framework like iOS.
Where it maybe a tad more complex is if as often in iOS you have lots of declares. Then you will have to refactor code accordingly. As Desktop is MUCH richer than Xojo iOS, it should not be too difficult.
Or, to save some time, add a Using Clause to the class youre working on.