are there any novels with a similar feel to Naoki urusawa’s works, in that they are primarily set in and maybe even idealising the 20th century?
Baccano Gosick Allison Lillia to Treize Meg and Seron The Story of One Continent Some of the kino no tabi stories
Never read the works of the author mentioned by OP but if I have to suggest something then I’d say Golden Time