An enlarged French fleet after defeat on land

What if France built the enlarged capital-ship fleet but still suffered a defeat on land like that of 1940?

The fleet could disrupt British plans if it changed sides, making an attack such as Mers-el-Kebir riskier and increasing the need to trust French assurances against capture.

A larger French capital-ship fleet would create a more dangerous problem for Britain after another French defeat on land. In the proposed deployment, battlecruisers could serve both at home and in the Far East, while much of the modern battleship force covered the Mediterranean. Vichy control of those ships would give France greater leverage, and their possible defection could upset British naval planning. Attacking the fleet might provoke the very change of allegiance Britain wanted to prevent. Britain could therefore have to rely on Admiral Darlan's assurance that the ships would be scuttled before capture, an assurance supported by the later historical French action. Ships remaining at Mers-el-Kebir would also be harder for Germany or Italy to seize directly.