Hi and welcome to KH!
Sounds like a very interesting pattern. The easiest way to keep in pattern is to do the initial increases in stockinette stitch and to stay in stockinette until you have enough sts for a complete pattern repeat plus the edge stitch. When you get to 6sts in stockinette stitch at each end of the sleeve for example, you'll have enough for another pattern repeat.
We'd love to see what this sweater actually looks like if you'd care to post a photo.