Canon USA has posted information about the RF lens control ring click stop removal service being offered. Note that the price seems reasonable considering the significant disassembly required for this service.
From Canon USA:
What is the Control Ring's Clicking Sound Modification Service?
Canon’s control ring’s modification service offers RF lenses and Control Ring Mount Adapter EF-EOS R owners the opportunity to remove/reapply the control ring's clicking sound.
Why might this be needed?
The click action of the control ring allows the user to have a sense of how much it is being turned. However, if used during video shooting, the sound of the control ring operation may be recorded.
|Control Ring Mount Adapter EF-EOS R||$59.99|
Customer Support Operations
Canon U.S.A., Inc.
Contact Information for Inquiries
Canon Customer Support Center
Phone: 1-800-OK-CANON (toll free) 1-800-652-2666
For additional support options: usa.canon.com/support