Hello!
My buddy Jiyone and I have been working on a project to convert maps/levels to become loadable in Fusion 2.5. There will be a MFA that goes along with it so all you would need to do is convert your map files, setup your layers, active objects, strings, and values to mirror the level editor of your choosing. No need to code anything and it should be very easy to setup! We plan to sell this tool once we finish so developers can enjoy the benefits of having their favorite map making software work side by side with Fusion. So far we have been adding support to the following software:
Tiled Map: Please login to see this link.
PyxelEdit: Please login to see this link.
If you have any other map making software you would like to see in this conversion too or any questions please let us know.