An Allied Scandinavia and Finland's alternative supply route

What if Britain and its non-Soviet allies secured a Stalin-Finland ceasefire to bring Finland onto their side?

An Allied Scandinavian supply route could reduce Finland's dependence on Germany and make a separate peace approach more plausible, though no agreed settlement is predicted.

The question proposes a British and non-Soviet Allied effort to obtain a ceasefire between Stalin and Finland. The answer concentrates on what an Allied Norway and Sweden would change for Finnish supply. If those countries remained outside German control, Finland could receive material through them and would have less reason to depend on Germany. That could alter its alignment when Germany attacked the Soviet Union. A Finnish peace offer at that point is raised as a possibility, without claiming that Stalin would necessarily accept it.