You can do number one, but when you reach the last four cuts, you flip the onion cut side down and dice from there.
This prevents wrangling the piece with the nails of your claw grip, as the base gets smaller and more difficult to keep up right.
It also prevents the more elongated cuts that so hurt (arguably, I’ve never had problems) the symmetry.
Bec oiseau (bird’s beak) knifes have a curved blade…