Yes jgrloit, I will be able to change SquawkBox to read a different port in which non-positional live aircraft details are output. Presumably this will be added to version 2.1 at the same time as port 30003 data is delayed.
With luck, you shouldn't have to do that. AirNav have stated that the port 30003 output is supposed to emulate the equivalent SBS port output (so that add-on applications work without modification) and that the current RB output is a work-in-progress.
From that I infer (and hope) that RB V2.1 will feature a fully-compatible port 30003 output, but so far AirNav support have neither confirmed or denied that, despite several requests - maybe they would care to comment this time around?
For info, the non-delayed SBS socket messages are AIR (new hex code) and ID (new callsign). You will be aware that neither, alas, contains the squawk.
Dave