To have become a divemaster (and thus a role model) in the first place, you already had to demonstrate good judgement and good diving skills, by agency standards. If someone asks you if the drysuit course is necessary, you can be completely honest, without being a bad role model. You can recommend the course, and advise that they not try diving a drysuit without some training. It is not required to have a card, and if you tell them that you tried it after doing the pool/classroom session, but before you finished the certs, you can also tell them that you were already a divemaster when you did that, and it might not be adviseable for them to do the same thing if they are less experienced. (If they are more experienced or skilled than you, then you won't really have to worry as much about being a role model.)
In the end, you did what you should have. The key is safety, not the card. You learned how to dive your drysuit safely before you tried it, and others should emulate that. If they do that, neither you nor they need to get the cert.
otter-cat