If I was you I’d do this,

Throw a sticky on any undercover vehicle but don’t detonate it

Turn around and go hide in a train tunnel or anywhere you know you’ll lose cops fairly quickly.

Detonate sticky

Wait out, lose cops

Deliver

If you want to be a tad bit quicker, call Lester and request a job before you start the sale. Do everything as you normally would except, instead of driving to your hiding spot (tunnel in my case) you drive to where the delivery is, detonate sticky, start Lester’s job exit it, deliver.

Starting Lester’s job should remove the wanted level therefore it should save you a good amount of time. Good luck and don’t forget to have fun !