Would anti-ship missiles have rescued Surcouf?

Would fitting anti-ship missiles such as Styx have made Surcouf's concept work?

No; a different weapon would not have cured the submarine's fundamental platform and operating problems.

A viewer suggests that an anti-ship missile such as Styx might have made Surcouf's concept workable. The answer is no. The surrounding discussion has already established that the submarine dived unpredictably, brought weapons into action slowly, and was highly vulnerable after surfacing. Greater weapon reach would not repair the hull, handling, survivability, and integration problems.