Understood. So what you are looking for is a method to generate QR Codes within Rhino.
Do you know Python at all? https://pypi.python.org/pypi/qrcode is a QR Code generator which can export SVG.
I think someone with good scripting (Python) knowledge of Rhino could write a fairly simple program to
- Accept input from the user
- Call the program above with the input from the user, with an output option of SVG
- Import the new file into Rhino.
Note I haven’t tried any of the above, but it seems like an outline you could give to someone good at scripting.