You could ask a wahm to make a custom!
I've found that my tall girl (she's been between 90% to off the charts since birth) does best with front snappers (but that's because of her chubby legs!) and wool soakers have been a GODSEND for her covers!
To measure rise, take a tape measure and measure (over a fitted for a cover and over nakedness for a fitted) from belly button to above the buttcrack.
I have been fortunate that things fit Libby best with the belly LOW, so it makes up for the high back rise.... she wears diapers a good 2" below her belly button, below her buddha belly
GOOD LUCK!
I've found that my tall girl (she's been between 90% to off the charts since birth) does best with front snappers (but that's because of her chubby legs!) and wool soakers have been a GODSEND for her covers!
To measure rise, take a tape measure and measure (over a fitted for a cover and over nakedness for a fitted) from belly button to above the buttcrack.
I have been fortunate that things fit Libby best with the belly LOW, so it makes up for the high back rise.... she wears diapers a good 2" below her belly button, below her buddha belly

GOOD LUCK!