Hi
Where I lived in Costa Rica is very far from their capital, and sadly all my friends still live there.
They now all working in the weekdays and it's not so easy to get one day off of work soon..
One friend of mine say he can try to make it, and I really appreciate, but I want to have police certificate as soon as possible....
I think that your best bet is to contact CHC processing your application, that as Costa Rican PCCs can only be obtained in person, and that you have no one in Costa Rica that is able to obtain it for you.
PMM