I've experimented more. Two methods here.
(1) Using a curved paper template and basting the round petal edge to the paper template, something like EPP. The basting threads and paper templates will be removed after the dresden plate is applique-ed onto the background fabric.
(2) Using Steam a seam2 cut into a thin curved strip. Stick 1/4" from edge of round petal. Snip, turn in to stick to tacky side. Steam iron to fuse. Ultra sturdy as it ends up with a somewhat stiffer edge.