Half lap roof tiles

Here's a seam that's labor intensive to construct when extending a Decra-tile roof. It's where the last row of new tiles meet the "first" row of existing tiles (the original first row at the eaves have been cut off). Roofs are always installed from the bottom up, establishing the position of all the pieces above it, so this less-than-full lap was unavoidable.
I think my solution created the least amount of work. I took advantage of the change in roof pitch. On the last new row I top-nailed a 1x2 batten through the tile to another batten positioned below it. The combined assembly must factor in the thickness of the tile scallops. But because of the pitch change, there was some room for error. It also required that the rear flanges of that last row be cut off. This is all easier said than done!