(Range is too high here, it was actually about 2200 miles overloaded with fuel)
Both of these aircraft were viable options for long range naval reconnaissance and were in fact used in small numbers in that role.
What if the Do26 was in full production for this role by 1940 and the BV138 had higher production? This would give the Germans much longer range, cheaper, and far more reliable recon for spotting for and liaison with Uboats than the Fw200.
Assuming the resources saved from not producing the FW200 were thrown into expanding production of these aircraft, while further resources are saved for this and other projects by no producing the Do217 starting in 1940, how much more effective would the Uboats have been during the 1940-1942 period?