1. You are correct.
You can configure CY7C65211 using USB-Serial Configuration Utility. Please check following page.
2. Hopefully, above page will be helpful for you.
3. I can understand your concern.
For mass-production, Cypress recommends that the customer uses "USB Serial Configuration Utility" command-line program for programming.
USB Serial Configuration Utility GUI is easy to program a firmware, but as you know it is not efficient.
For more information, see the thread as follows.
Regarding the CP parts, it depends on the end customer product amount.
Please ask local Sales/FAEs. We are not able to answer it on the Community.
FYI: If you are interested in USB-Serial FAQs, kindly go through following FAQs. (JA) is Japanese version.
I really appreciate your helps always. My questions are clear and will contact to local Sales/FAEs via other way regarding CP parts.