Wow. Looks like Rolex deems them to be "counterfeit" as per the statement at the bottom of every Rolex invoice receipt. it states;
“The addition of non-genuine parts to any Rolex watch renders it counterfeit as defined by Federal Law. It is therefore unlawful to sell or offer such modified watch for sale. Rolex will not service watches altered with non-genuine parts or accessories. "
see
https://www.rolexforums.com/archive/.../t-173168.html