Actually there is no problem with just adding monarch and leader files ending with .ARG since ARG exists as a possible revolter in the IGC as well as the GC. The IGC config tool will not care. Neither should there be a problem adding Aragon to 1492_IGC.inc as long as you take care not to interfere with the config stuff there. Once it is there, Aragon should even be selectable as a playable nation in IGCConfig. 
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