Hi James,
First of all, sorry for your loss, but that's a lovely story and great memories.
I had a small guitar shop for a couple of years and always had some left handed stock available. Sometimes with beginners they wanted the guitars demonstrated. I was amazed at how quickly I became able to put a few chords together. I think with the motivation you have this may be easier than you expect. Good luck, and keep us all posted with your progress.
Mike