A good looking fly that will certainly work.
I agree with earlier comments that it's not a diawl bach - it's more of a snatcher pattern.
But we can get too caught up with all this naming lark.
It's a nice concept for fishing the upper layers and you've had the imagination and confidence to put it together.
Use those same qualities when you fish it and tight lines!

__________________
Andrew W

"Maybe all one can do is hope to end up with the right regrets." Arthur Miller