Ok, I just decided to take my drawing to Paints and put my ideas to work there and came up with an EASY way to do a starry bullseye WITHOUT PP. This idea was from one of my blocks I hand-drew yesterday on paper of 2 prongs of the star (which will make it easy) in a quarter block! Then I went to Paints and duplicated my idea there. I didn't exactly get it all perfect in Paints, but it's good enough you can see how it will look when the 4 blocks merge.
In looking at my drawing, you can see that the largest fabric, pattern "A", will go down first on top of the fdn. piece and then you'll add "B" and it'll make a star shape that will be faster and easier than the Twirling Triangle pattern of Fons and Porter. Also, "A" will be all one piece and not like it appears in the drawing to be separated. I will then be working on getting your separate pattern pieces to download. Here's the drawing.
This is much easier than 3 templates like Twirling Triangles and better than a 6-pointed star and having to match all those points in Twirling Triangles. I think this will work great showing a very large scale print in the background of "A" and mixed with something opposite in pattern "B" or vice versa! I can see how it will be exciting if you use "B" for merging large florals, stripes, checks, plaids with a near-solid in your "A" pattern that will look fantastic when the 4 blocks merge!