Yes, if you're doing the seed stitch and decreasing on each edge, you're probably just fine doing it as usual.
But if you're doing your decreases in the middle of a row, there's no way to avoid getting 2 knits or 2 purls together after the decrease.
One solution might be to put your seed stitches inside like a column with a rib running down each side. Put purl stitches (right side) between each column of seed stitches.
Another thought might be to... (right side) for the decrease row, do a straight knit all the way across, decreasing as needed. Then resume the seed stitch for the next X rows.
But you cannot really decrease within a row of seed stitch without things going wonky - until the next decrease row, that is.
My words sell the Magic of a Dream