Welcome the the forum and congrats on your new boat!
I have a furling jib and normal jib setup, for the furler, depending on which one you get, you might need different bridle wires, the furler and a furling specific sail, preferably with UV material on the parts of the sail exposed to the sun when rolled up. Most kits will come with everything you need minus the sail.
Mine sail is from here:
http://slosailandcanvas.com You should ask them about converting your existing jib, from the differences I see between mine it doesn't look like it would be ideal considering the cost of a furling jib sail made how you want it and cost to work on a sail.
I also think you'll be hard pressed to drop the main while out on the water, especially if there's decent wind. You would need to get to the very front of the hull to release it from the halyard hook at the top. Not saying it can't be done, I've walked out there to adjust a go pro on the water, in very light winds and calm seas but wouldn't commit to having to do it every day I wanted to sail. Is there a beach you can pull up on before turning into your canal?