Well, I can tell you straight up that you cannot just mount a remote trunk activator without first installing a solenoid to open the trunk.

You have more than one blank by the weee-brake. BTW, put the valet switch OUT of plain view. That's what I would do. Actually, I have no valet switch in my car, because on Vipers all you have to do is hit lock unlock lock with the door open and it goes into valet mode.