After finding out how to transfer normals to another object I created my first Blender add-on which makes this an easy feat. The add-on provides the ability to Transfer Normals between objects in Object Mode using Alt+N and Shift+Alt+N. Optionally vertex colours can be transferred as well.
All you need
The add-on allows you to (more easily) make separate objects connect seamlessly without joining them, which can be useful when creating elements for your game worlds.
|Alt+N||Transfer normals from selection to active object|
|Shift+Alt+N||Transfer normals from active object to all other selected objects|
|Ctrl+Shift+Alt+N||Clear custom normals data for entire selection|
To try out the add-on without the need to create a suitable set of meshes you can download this blend file: