Hi and welcome!
Yes, I think your idea of knitting the bottom twisted stitch pattern from the hem up and then some of the second pattern is a good one. It may not be so straightforward to graft
while maintaining the second pattern stitch (sort of a double leaf?) but I think that's an easier fix than trying to knit the lower portion of the dress upside down. You're sure the missing 8rows are in the skirt portion and not above the armhole bind off?
It's a lovely dress
and perfect for the coming warm weather.