Question about the order of steps in knitting a seamless cardigan...

[untonuggan]

So last night I was gifted 750 yards of Malabrigo Silky Merino. Yay! It had been sitting in someone's stash for a year and they thought I could make more use of it I guess. Anywho, I would like to make a cardigan out of it - probably with short sleeves given the yardage and because the colors are hard to match.

I am thinking of making Knitty's Amiga cardigan, which calls for 2 skeins of 437 yards (874 yards) each for sizes small, medium, and large. I would like to knit size medium. I think probably going to be knitting shorter sleeves to compensate for any difference in yardage, unless the pattern is just really non-specific because of how big the balls of yarn are given in the pattern.

Here's my question: the pattern is a seamless design, and calls for one to knit the body, then the sleeves, then the button bands. Is there any reason why I couldn't knit the body, then the button bands, then divide what yarn I had left into two equal amounts and knit the sleeves until I ran out of yarn/decided they were long enough?

Thank you in advance for any responses!