There s no need to scale down the jumo 213j. With an output of 2600 ps , installed in a ,D-9 airframe (4100 kgr weight) the result would be spectacular performance. The problem is that
a) they would use it on 5+ tones Ta152
b) jumo 213j was scheduled for production in September 1945...
Only jumo213EB was production ready. Not as spectacular as the j , but still of decent performance given the limitations German industry faced