My unfinished dovetail invention

I like to handcut through-dovetails, I use an old Sears jig when I make half-blind ones like for drawers. I enjoy cutting the tails, but the pins, well that’s another story! So, I wondered if I could make a sliding jig, similar to the common crosscut cradle that a lot of you have made. I theorized, if I made a pivoting backboard, that would do, say 7 degrees in either direction of the sawblade’s line of cut, clamped my workpiece to it, and made two cuts, one 7 degrees to the left, then pivot it 7 degrees to the right and make the other cut…what would it do?
Using a center-finding ruler, I marked out the center of each pin to be cut, and progressively lined up the marks to the centerline of the pivoting axis. It’s hard to visualize, even harder to describe, so here are some pics: http://i280.photobucket.com/albums/kk161/poopiekat/IMG_0313.jpg http://i280.photobucket.com/albums/kk161/poopiekat/IMG_0312.jpg
http://i280.photobucket.com/albums/kk161/poopiekat/IMG_0311.jpg
http://i280.photobucket.com/albums/kk161/poopiekat/IMG_0310.jpg
http://i280.photobucket.com/albums/kk161/poopiekat/IMG_0309.jpg

So… with the sides of the pins cut, and waste chiseled out…I then transfer the lines to the adjoining pieces… and cut them by hand, and get a reasonable fit right off, with some minor rasping and paring.

My question: Can anyone think of a reliable way to jig up matching tail cuts on a table saw? It’s a real brain-teaser, has anyone ever attempted such a device?

-- If stradivarius was alive today, he'd be using Gorilla Glue.