Reinforcing Malaya and deterring Japan

Would a quieter Mediterranean let Britain deter Japan more effectively in the Far East?

Yes; experienced divisions, armor, ships, and support for China could all move east instead of being consumed in North Africa.

The counterfactual also changes the land war. Experienced Indian and Australian formations historically committed to North Africa could instead reinforce Malaya. An armored brigade or cadre could provide both battlefield strength and training for local forces. Continued support through the Burma Road might also give China armor and supplies, raising the cost and uncertainty of Japanese expansion before war begins.