Replacing lap siding boards

Me again. :-)
I have two lap siding boards on first level that have warped due to water -- one from water bouncing off of shrubbery, one from water bouncing off of the trash can. The thin edges of the beveled boards have warped out form under the next higher board. (Possibly they were not set right originally.)
The one from the shrubbery water bounce is the main problem. I gave a hard look at that lap board yesterday and it goes behind the structural parts of the front porch. Taking all of that down (or partially out from the house) to replace that board appears to be the worst option available.
One option I had considered was wetting, attempting to "unwarp" the board by laying it flat on the driveway and leaving weight on that thin edge for a while, and resetting it. I already know the boards that have been in the baking sun since 1984 are brittle from trying to reset one on the house next door and having it break on me. (I carefully tacked that one back together, spackled the bejesus out of it and moved on and came back later and painted it -- looks great! ;-))
Since the warping does not extend behind the porch, scabbing in a siding board before it gets to the porch sounds like the best approach. That of course depends on me locating matching siding (I have been unable to locally so far but have some leads to some large lumber suppliers from who experience shows that they will be pretty disdainful of someone who wants to buy two boards and not several thousand linear feet.) or me faking it pretty good since both bad boards are right on the front of the house near the front door.
I have watched (or passed by) people scabbing boards but my own experience in doing so is limited to about 10 inches of downboard on the chimney chase.
Any ideas or thoughts? Maybe a 1, 2, 3 recipe?
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