"Space" is "Enter" if an image is visible

[Nige_S]

@Frankb

But I wonder why this does not work? ⌥p should open the KM palette and ⌥ü the BTT menu.

You're much better off triggering BTT then calling KM by script than trying to trigger one thing in BTT then another, manually, in KM.

Examples of both how to call KM from BTT and how to call BTT from KM can found in this thread.