SZ 112 is the gateway into the Baltic… As long as you have SZ 112 defended you can pick up reinforcements with the 3 TRN in SZ 111 and invade England through SZ 110.
Don’t think the French could help all that much, except for defending England. The Italian player on I1 can kill their fleet off Marseilles, and the DD off Madagascar is too far away to help in time for F2. Even if the Brits try to reinforce the French fleet in that same SZ on UK1, they’re not going to reach SZ 110 in time to block on UK2/F2.
The UK could potentially move EVERYTHING in the Med to Gibraltar on UK1, to block SZ 110 on UK2, but then that way Italy gets to be a huge factor in that theater. And the fight for SZ 110 is still dubious with Germany’s entire airforce in range to destroy it on G3…
Hmmm… Thinking 1 CV 2 TRN may be the way to go from here on out for Germany! LOTS of options and not too restrictive for G2 70 IPC buys, in case you change your mind about Barbarossa!