That's a rather advanced JP1 question, so you would do much better asking in the JP1 group.

When you ask there, you probably should give more detail on the decoded signal. Some Pioneer signals get decoded as one NEC signal. Others get decoded as two NEC signals. You should tell the device(s) and OBC(s) of the one or two NEC signals. That would allow a Pioneer expert, such as Rob, to figure out how to construct the hex command.

Even if you just want a key move, no a device upgrade, you should read the section of the KM documentation on making a Pioneer upgrade. If you set up KM for the same protocol as audio/1023 and figure out how to specify the right device and OBC info, KM will compute the right hex command for you. Then you can use that hex command in a key move (you don't need the device upgrade that KM was building).