I look at it load wise on the servos it would not like. Many blades like the proclaimed edge blades have a very close to 0 degree on the blade. If the delta is 0 on a flybarless system you have the least load on the servo possible when doing manuvers. If you had a high G manuver and you have curved blades your amp draw in your servos will spike, Pitch pumps you would slam the servo. If your servo could hold the torque even even slight swept would add load. Why not add a decal on the blade with a serval degree offset so in flight you see the offset.
I like the pic. I don't see a old lady knitting a monkey though..haha.