Inspired by the conversation here: https://www.ravelry.com/discuss/patterns/4063023/
Work the 1-to-5 increases as k1,yo,k1,yo,k1 all in the same stitch. Work the 1-to-7 increases as k1,yo,k1,yo,k1,yo,k1 all in the same stitch.
The WS decreases near the edges on Row 2 can be done as you see fit - just make it look like stockinette from the front. This (probably) means one of these:
Shown with a cast-on count of 19 stitches.