A word to an aircraft split in 1953:
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Even as this looks somehow comprehensible it makes no real sense. Why? The development of jets after WW 2 relied strongly on captured German technology and the increase of thrust of early jet engines.
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Countries like Germany and JP as losers of WW 2 would be limited to WW 2 designs without giving them the possibility to benefit from own stronger engines like the HeS 011 and to benefit from their technological advantage.
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There were no competitive USSR jets - the sole exception, the MiG 15 is powered by a copied British engine and looks like a c+p version of the Ta 183. Even the P/F-80 was inferior as the airframe design limited the performance - the F-86 used the swept wing research results by captured scientists.
In other words: As gaijin stated multiple times that they wont add Luft 46 aircraft - there is no need for a such a cut at 1953 on a stand-alone basis. In case there would be a hard cut in 09.1945 upfront it looks different.