I too an an admirer of Rosenberg.
I think there are many 20th-century composers would fall into the 'wrong-note-Romanticism' category, such fellow Swede Karl-Birger Blomdahl, Kalavi Aho, Jehan Alain, Barber, Bliss, Bridge, David Diamond, Einar Englund, Vagn Holmboe, Jolivet, Uuno Klami, Poulenc, Prokofiev, Roussel, Shostakovich (to a certain extent), Robert Simpson, Tubin.