This morning I remembered something called a sling heel. I’ll link to the pattern but am not suggesting you buy it, you almost certainly don’t need to even if you would use the heel. There was a free version for something pretty much the same that I saw but I can’t find it now and you really don’t need it either. Basically it’s a short row heel worked all the way to the center front. I think I left a stitch unworked between turns. I would have used GSR but any way you do short rows could be done. I then resolved the turn stitches and ‘short rowed out’ to complete the wedge. (IMO as a heel it’s a fail but as a shaping technique it’s got it’s uses.) If there are no stitches between turns you’ll have more fabric in the wedge, space the turns more and adjust the shape. HTH
ETA I figured out how to find the freebie.