So I am currently writing a TL where I am behind on the technical aspects of some Luftwaffe requirements. Something like this would take over the whole TL or vice versa so I am posting it seperately. Please respect that.
The change is in the 1933 call for air craft designs. They called for (disclaimer, wiki quote):
During 1933, the Technisches Amt (C-Amt), the technical department of the Reichsluftfahrtministerium (RLM) ("Reich Aviation Ministry"), concluded a series of research projects into the future of air combat. The result of the studies was four broad outlines for future aircraft:[6]
Rüstungsflugzeug I for a multi-seat medium bomber
Rüstungsflugzeug II for a tactical bomber
Rüstungsflugzeug III for a single-seat fighter
Rüstungsflugzeug IV for a two-seat heavy fighter
Now assume already at this time they include a 4 engine heavy bomber so that not only Dornier and Junkers are invited to participate as they were in 1935 resulting in JU89.
I would assume this design is to anticipate an engine like the DB600 but may be tested as a prototype with the BMW VII which was ready in 1930 it seems (
https://en.wikipedia.org/wiki/BMW_VII). These engine types were also both tried on the DO17.
The Range needs to be sufficient to hit targets in northern england from Germany.
Now lets not go into what they are not doing. Assume this program can get 10% of the LW budget of OTL and remember there are no aluminium shortages here and neither were there until later IOTL.
Now, what might the german aircraft industry come up with? You can assume either that they do or do not think that the engines will improve their output from the 700 hp's range towards the 1000 hp range.