Hey Frank. Remember we had this discussion before? You can't mix simulated and real hardware events with KM. What's the use case? Why not just remap the key command to something else or use a palette? ⌘F would open the palette and a would trigger your action. As I said, it really depends on the use case.
If you really must do it the way you're describing, the only way I know of is to use AppleScript: