When I had my Submariner serviced by RSC in 2014 I sent the watch direct to Rolex with specific instructions re not refinishing the case to which they adhered.
I don’t think you can send the watch direct anymore, certainly I had to use my local AD last month when I sent it in for its 5 year service. I would imagine that you could ask the AD to enclose a letter re your requirements.
I know Omega will send out a service pack direct to customer if requested and you can bypass the AD accordingly. This works very well for me as you can include instructions re your requirements. I did ask RSC direct if they could do this but they declined.
I much prefer Omegas approach in this matter.