If anyone is interested, I have now experimented with the Ti lid of one of my pots as the heat diffuser, and it worked fine. Bread did not turn out, but that was my fault for using the wrong type of UK flower!
Dave, I think I will put your rock idea to use (in this case 3 small ones) to give me a little more separation from the Ti lid and the Pot.
Stuart – advice noted, and I see it as essential with your method of a totally enclosed system with the roasting bag. The Outback Oven allows for the use of a non-remote canister stove if you are careful; however, I do recognize the risks and like your method better.
I look forward to testing your method out with my new remote canister stove (that I expect to arrive from Amazon today). With a Ti pot as the cooking vessel, the lid as the heat diffuser and the roasting bag, you end up with a baking system with little weight penalty with the exception of the extra few oz of the remote canister stove (the point of your original article - thanks!).