With the Dassault Super-Mystère not entering service until 1958, France would have to send its Dassault Mystère, which entered service in 1954.
The Hawker Hunter entered service in 1956, and may be the best choice to tackle the MiG-19.
The Saab A32 Lansen could also give a credible fight, having also entered service in 1955/56. Too bad the fighter J32 isn't ready until 1958/9.
The British Fleet Air Arm will be useless in this fight, as their straight-wing Sea Hawks must soldier on until 1958.

