Star Layer Separate:
(Note: Large stars might leave behind faint remnants, they are easily removed after the action with the "healing tool" in the tool panel
(Note: the effect of this action is subtle so as to not overdo it in a single action, feel free to run this action multiple times to get the effect you desire)
The final result of the mosaic is in a thread below after some fine alignment of the panels (since I shot in alt-az and therefore had rotation throughout the night) and final levels adjustment then changing the opacity of the panels back to 100%.
More to come!!!