But…the more I think about, the more I know I am not over thinking it.
Fundamentally, it just matters if @len is okay with it.
In my own companies I have worked for, however, they have had very strict rules about when you could use a company logo and how you were allowed to represent the company. If the logo is involved, you are considered representing that company, even if casually so. So rules are put into place to protect the integrity of the company itself.
It @len has no issue that anyone and everyone who buys this shirt is also being considered certified in some manner, that’s fine then.