I'd steer clear of sep-0007. It's bad enough in itself, but suggesting to use it for QR it outright crazy.
QR codes become more difficult to recognize and decode the larger the data they represent gets. Having unstructured, and practically unbounded data, à la sep-0007 is just a recipe for disaster.
Me and sacarlson did test years ago, and while my phone could decode 1000 character QR codes, his couldn't.
These were not entry level phones.
(Edit: Just to clarify, you're fighting the limits of optical resolution here, since you have a limited amount of screen space to display these codes in. This makes it harder for a camera to get a clear picture)