I'm guessing that you didn't get any response because nobody has experience with this problem.
Personally, I'd probably just add the rows to the sleeves, subtract the rows from the back (I usually have to make armholes smaller), or the divide the pieces at this point.
The short rows you mention will probably work too, but without the piece right here, I'm afraid I don't really know.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
IngridKH on Ravelry