So basically RLM opts to support the Fw's long range fighter instead of MTT's, possibly because the former is a better performer on same engines (= Jumo 210 in 1937) and it is only to be expected that on more powerful engines the 187 will still outperform the 110. RLM stipulates that they will but a 2-seater, so that is what enters the production at multiple factories, same ones that were making the 110s historically - Fw, Gotha, MIAG and Luther - but not MTT.
The DB 601 powered version is in production by late 1939, and it is not using the steam cooling, but the 'normal' radiators.
The Fw 287 and 487 were never a thing, I've invented these to cover the later 187s that can be more or less modified and improved - talk Jumo 211 powered version, or the versions with radial engines, or perhaps the latest development past 1943 with fully rated DB 605s with MW 50 and 30 mm cannons. Note that Fw does not make the Ta 154/254 in this timeline, but they still make the Fw 190.
The DB 601 powered version is in production by late 1939, and it is not using the steam cooling, but the 'normal' radiators.
The Fw 287 and 487 were never a thing, I've invented these to cover the later 187s that can be more or less modified and improved - talk Jumo 211 powered version, or the versions with radial engines, or perhaps the latest development past 1943 with fully rated DB 605s with MW 50 and 30 mm cannons. Note that Fw does not make the Ta 154/254 in this timeline, but they still make the Fw 190.