I think for the LoRaAlliance certification, the PIC micro within the RN2483 will not be able to run user code. This is a similar situation with the MultiTech mDot modules where the micro can actually be reprogrammed, but to use the LoRaWAN part you must use the binary only library to keep the FCC/CE certification.
However if you are not interested in certified products and are using them in a private environment, then being able to reprogram the PIC micro within the RN2483 might be a cheap LoRa device. Anyone with the appropriate PIC toolchain should then be able to get this working.
Andrew