Only works if the British are utterly stupid. The patrol planes aren't going to be "drawn off", they will continue to patrol, thus U-boat "wolf-packs are pretty helpless unless fortunate enough to be directly in the path of the CVE's course. So you think the KM and Luftwaffe could afford to fight a major sea battle every time they wanted to launch, undetected, a strike of VLR aircraft over the Atlantic? How long before they run out of naval ships and aircraft? Is that the one sub-titled "The Luftwaffe's Ill-fated Campaign"? Yeah, assuming they now EXACTLY where the convoy is. Without radar and without being able to sight it visually, how do they do that? The CVE's radar will be able to pick them up at about 100 miles, unless of course they are flying very low (which means they will have even less chance of sighting any convoy). Either way, the advantage goes to the Convoy/CVE because they will know the bearing the attackers are approaching on and will have a very good idea of the position long before the bombers can attack.