Queen first, lose (or draw) later 4

Question

Base: Queen first, lose (or draw) later

4. What is the most economical pawn endgame position where Black queens first but White wins, White pawns no higher than 6th rank on time of Black queening? (3+1 pawns suffice, so try to find or even beat that!)

Answer 1

Obviously optimal :

[FEN "8/5p2/8/8/8/1P6/2K5/k7 b - - 0 1"]

Black promotes first, with the wP still on the 6th rank, but they got mated after

1...c1Q 2.g7 Kh7 3.g8Q Kh6 4.Qg6#