This may take a whole tablet of graph paper, but that is the way I would go--tape the pages together and draw your pattern using the narrower strips. Once the lone star is drawn, the size of the setting triangles would be easy to figure--plus the angles are the same, it is just the size that is different and if you over cut, it just means wasting a bit of fabric. I resized a Labyrinth Walk pattern on graph paper and it turned out gorgeous with no problems other than a headache from trying to remember to add that half inch.
At least try it.