If I had a tubing cutter then I'd use it. But if I didn't I wouldn't go out and buy one just for this sort of job assuming you have a hacksaw and a file and some sort of way to make a guide be it a hose clamp (nice one dobber!) or some masking tape to do the wrap trick.

There's lots of ways to remove the internal burr as well. I often used to use a sturdy small bladed knife to cut away the burr. These days I've got a triangular shaped deburring tool that does a nicer job but the point is that again you don't need a specialty tool. Just try some of the things you have already.

Oh, you can even make your own triangular deburring tool. Get an old worn out triangle file from a second hand store and then grind the last couple of inches of the flats down so they are smooth. A bit of stoning on the flats to smoothen then up and you've got a pretty nice little triangle deburring tool of your own. Cut off the tang to shorten it up a little and perhaps slip on a cover of plastic or rubber tubing to form a grip handle and now it's a first class tool that you'll have for years to come. As you have to regrind and restone from time to time you just push more of the file out of the tubing.