Troy:

There are quite a lot of 2D barcode scanners for the iPhone, so if you changed your whole system to use Semacodes then that would work.

Also, the iPhone camera can focus on and scan 1D barcodes if it has a macro lens. Macro lenses can be bought (eg the Clarifi case) or even improvised for testing (by putting a magnifying glass over the camera).

This isn't as quick or reliable as a proper swiping barcode scanner, of course. And you quite possibly know all this.