Let me tell you about CIPS then sign it because it is meaningless.
CIPS wants to portray itself as Medical Doctors, Engineers and Chartered Accountants but they are not. As a CIPS member for more than a decade let me tell you that CIPS is an organization for consultants to meet for drinks. Salespeople and managers are CIPS members. There are very few people who do anything more than sit in meetings, talk and send emails. CIPS talks big but that is because the regular jobs of the members is to talk big. If signing the form means that you can get another consulting job then sign the form because that is the purpose of CIPS which is to show that the members are better than the people behind the counter at Best Buy. There will be many CIPS members that have been in similar situations where the formal education does not match up with the check boxes on the cross border forms. It might be worthwhile to hire someone to get the specifics about the requirements for cross border working.
My understanding is the standards for other "professional" jobs such as hair cutting and fixing car brakes have more requirements because they are considered to have a direct consequence on the health of the public than the IT jobs. That is the context of the professionalism. It is wonderful that you take your professionalism seriously and I encourage you on that because it distinguishes you from all the others who don't give a damn.
Your knowledge, experience, and that you care about the quality of the product given to the customer says much more about you than a formal degree from a self serving group such as CIPS or a self serving institution such as a university. I also hate calculus and have never used it outside of a calculus course so I feel it does not need to be taught to 99% of the people who are required to learn it. A practical course on statistics would have been much much more worthwhile.
If you cannot decide what to do, do what I did: buy a sports car. You can see the Miata being driven around in the snow even in the middle of winter.