Busted ribs are a right pain - you've got my sympathies there...
You could try carving a few little things? Maybe more ornate than usual, depending on your skill level I suppose.
As you're a bit imobilized, you could see if you can really 'survive' on the contents of your survival kit in an 'emergency', in the garden or the front room not deliberately marooning yourself somewhere
what might be dead simple as a fully fit adult might not be so easy with limited movement? If you find you can't do something crucial, you can always go inside and sit on the sofa with a cup of tea to think how to improve your kit or technique, then let us know too
Finally, spend your new found free time hunting on the web for better deals on your mortgage, insurance, loans, credit cards, gas and electricity, etc etc... then work out which custom made knife to buy with the money you've saved