So I was knitting merrily away on the sleeves for my next short-sleeved lace top, just about to finish the second one, when I looked at my remaining yarn. Suddenly the ball from which I was knitting started to look very small, there wasn't nearly enough yarn remaining to knit the yoke and saddle shoulder, let alone the picot bind-off.
Hence, Plan B. My short-sleeved lace top is now going to be a sleeveless (or at leat cap-sleeved) lace top, instead of joining the sleeves together with the body to create the yoke I've crocheted a provisional cast on in place of each sleeve and knit across that. Once the yoke and shoulders are finished (assuming I don't run out of yarn) I'll undo the provisional cast on and knit the picot hem down from that point.
That's the plan at any rate.