LoRa stack and DIOs

Dear All,

There are two popular open source options of LoRa stack for SX1276 chip as an end device:

1. IBM “LoRa WAN in C” (http://www.research.ibm.com/labs/zurich/ics/lrsc/lmic.html)
2. Semtech "LoRaMac-node" (https://github.com/Lora-net/LoRaMac-node)

If I got it right, the IBM version uses only the DIO 0-2 pins on SX1276 while the Semtech implementation uses all DIO 0-5 pins.

The custom schematic with SX1276 I have uses only DIO 0-2 pins so using of IBM stack seems to be natural. However, the Semtech stack provides ping-pong example between two nodes which I would like to use (IBM stack's examples seem to work only with gateway).

So my questions are:
1. how hard will it be to adapt Semtech LoraMac-node stack so that it uses only DIO 0-2 pins?
2. I guess a simple DIO remapping will not do the job and one will have to modify all those parts of the LoraMac-node stack where DIO 3-5 pins are used?

Any hint would be of great help!

Thanks a lot in advance.