Edge blending 2 quads

This seems like it should be simples.

I have two quads.

I have a smooth fade on the edges of each one, applied to the alpha channel.

I then overlap the quads on this region and alpha blend.

How do I get the result of the blend to be the same regardless of which quad is drawn first? If it was in a shader it would be a case of ((X.alpha*X.colour ) + (Y.alpha+Y.colour))

Post your sample patch

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