I made a windscreen for my super cat stove out of a disposable aluminum roasting pan formed into a tube. I'm sure you could make one that will work for the Trangia this way too.

You use two pieces of wire or even tent stakes to slide through your tube to hold your pot above the stove. Here's almost exactly what I did...



The difference is I cut the bottom out of the roasting pan, folded it lengthwise like a three panel brochure so it is three times as thick, and I made mine in one piece. The ends clasp together just like in this video.

My pot sits right on top of the super cat stove so I don't use the tent stakes to hold it above the stove like you would with the Trangia, but I'm sure you get the idea.