You ahve to allow each side to see adjacent territories as well. Might even want to allow them to see what is in “aerial recon” range.
Still makes for an interesting twist, since counter-attacks would be largely unknown…
I agree with point 1, but I’d add something to point 2: Enemy fighters can attack recon fighters and any AA guns can shoot at recon fighters.
BTW, it’s done often and even has a term: “Fog of War”
I have not done it in Europe, however I have played Classic this way. (We let you roll for intelligence for each die result of 6 you rolled again and that’s the number of territories that did not border your forces you got “intelligence” on.)