I wouldn't put a QR code on it pointing to a website.
The elegance and genius of the message is the universal truth of its message.
It unites millions of people, with very different ideas about the world and how they lable themselves within it.
It is in such glowing stark contrast with the opposite statement in needing no further explanation, whereas the opposite has to come with the baggage of a shit tonne of post modern gobbledygook.
Because it is faction-free as a single statement it can be taken by individuals with wildly different perspectives and turned into their own personal small act of subversion in the face of the current atmosphere of WrongThink Will Cause Silencing And Punishment.
This could snowball into something with uptake from all sorts of people, and cause many a varied water cooler conversation that includes a lot of perspectives, one of which might appeal and hit home with the original person who got confused by a willy on the way to work.
And... if this does snowball, MSM will have to focus on the willy and the statement (not shift the focus to the attached website), go all standard regulation handwringing about how awful it is to say ".women don't have pensis " and promptly peak thousands upon thousands upon thousands.
I vote for don't mess with the simplicity and clarity that is the absolute genius of the design and the Act of Resistence as it currently stands.