So all you've got is the sleeves right?
Put it this way: lots of the times, by the time you get to the sleeves of a jumper you're REALLY bored with it. Well, you've got that bit out of the way!
Steeks sounds well scary to me.
Cant you make the sleeves into regular raglan-shaped ones, then you can just sew them to a regular raglan-shaped front and back when you get the energy?
Here's a pattern generator for any size raglan jumper you like
OR. Stick it back in the bag and go knit a quick hat or something easy that'll get done quick and make you smile