Did you try the mirrors to see what you think?
It's lovely fabric, and would be calling out to me too! ... though my gut feeling is that the flowers are too large, and without much variance within each. I'm not sure this fabric would show itself to the best in a OBW, even in the larger size triangles.
However, there is a way you could try it IRL, without wasting a lot of fabric. Cut a strip the full length of the six repeats of the large size triangle you are considering. Then stack up your six layers and cut.
Worse case scenario, you make a few blocks and say, oh no ... and have some orphan hexes to do something with.
Best case, you say, Yessssssssssss and continue on with the full yardage.