That's a great idea! Mark also mentioned to me that you can buy rolls of the backer seperately, too.
The good news is that I called Beacon today (I still haven't received an email reply), and you treat it just like regular t-shirt vinyl...you don't need transfer tape.
Once we have our vinyl cutter we'll order some from TuffCut from Joto first, mostly because it costs less and we'll report back.