Have you checked the peony forum? Like you said the intersectionals are still quite expensive and fairly uncommon. I wouldn't divide mine unless it was for something really special but I only have 1. Maybe someone on the peony forum has multiples that they'd be willing to part with.

Beautiful! It looks very similar to the Cora Louise, except the Cora has more yellow in the center. If I can squeeze one more Peony into my garden I am definitely getting a Raggedy Ann.

Your going to need plans to submit for your building permit more than likely with an engineers stamp or architect so that may be a good place to start as you will be changing or altering the structure (roof and roof loads) of your home. And generally this would all be done in conjunction with the framing for the porch.

I'll say, it's not ideal but that doesn't mean it won't be just fine if its flashed and finished properly. Fortunately you have a good size eave right above it and because of the roof slopes not much rain will head to that valley. You may get some debris build up but it really just depends on your site and the wind around your house. If you extended the porch roof into the 10/12 roof you would still have a condition that needed to flashed properly to prevent future headaches. The advantage to the location of this valley however is that it appears it is entirely 'outside' so it is not over an interior finished space - and I would much rather have a leaky roof over a porch than a leaky roof over a living room.