Clear the aircraft to high levels in the airways clearance and let the SID do it's job.
If unrestricted climb is available - 'cancel altitude restrictions'.
If you need to take them off the SID then all bets are off. Stop climb if required for separation.
NB: The UK doesn't do it this way currently so the 'new' RT will cause confusion unless the procedures are changed. I wouldn't be changing one without the other.
Good luck guys.