I addition to the above, missed approach at 2000 fpm rate of climb would put the aircraft at 3000’ AGL in a minute.
Departing aircraft at 2000 fpm would be at 2000’ AGL in a minute giving you 1000’ separation.
Oversimplification yes.
“Aircraft One expedite climb and maintain (missed approach altitude) contact departure 126.8
Break,break
Aircraft Two rate of climb 2000fpm or less maintain (minimum vectoring altitude) contact departure 126.8”
Something like that.
Easy piecy lemon squeezy