RE: Lozenge
Yeah, but applying heat to painted fabric might not be!
Here's a quicky test of the woodblock idea. The results are encouraging but my technique still need a lot of work. For example, I need to get a rubber roller to apply the paint evenly. For this test I just moved the pattern piece around in a drop of two of unthinned paint on a smooth piece of piy. Also the surface of the pattern wasn't absolutely smooth. Making the stamp from rubber material might also help.
Again the idea would be to have multiple raised areas and stamp large areas at one time. It would only be necessary to stamp an area as wide as the original fabric.