Similar to [name_f]Dorothea[/name_f], yes. But a little more out there, so it’s likely your husband will like them even less
but maybe they’ll help warm him to [name_f]Dorothea[/name_f]!
My top suggestions would be [name_f]Athena[/name_f], [name_f]Theodora[/name_f] anddddd [name_f]Eleftheria[/name_f] 
Obviously, they’re all Greek. But they’re also all similar in style (longer, more syllables, ending in A and the Greek TH sound) to match [name_f]Dorothea[/name_f], but with different nickname options to possibly suit your husband.
[name_m]The[/name_m] name you already have, [name_f]Dorothea[/name_f] - means gift of [name_m]God[/name_m] as you probably already know. Most common nicknames are [name_f]Dodie[/name_f], [name_f]Dottie[/name_f], [name_f]Dora[/name_f] and [name_f]Thea[/name_f].
[name_f]Theodora[/name_f] - same root word etymologically so it’s basically as it sounds, the same name but flipped around, with the same gift of [name_m]God[/name_m] meaning. Most common nicknames are [name_m]Theo[/name_m], [name_m]Teddy[/name_m], [name_f]Dora[/name_f], [name_f]Dodie[/name_f] and [name_f]Thea[/name_f].
[name_f]Athena[/name_f] - very popular across many different countries, Greek mythological meaning, gorgeous historical place name but not many nickname options (Atty, Athenie… Maybe also [name_f]Thea[/name_f] at a stretch)
[name_f]Eleftheria[/name_f] - a recent obsession of mine after listening to [name_m]Konstantinos[/name_m] Argiros’ song “Eleftheros” and discovering it means freedom in Greek. Particularly love the nickname options [name_f]Effie[/name_f], [name_f]Elfie[/name_f], [name_f]Elsie[/name_f], and, again, [name_f]Thea[/name_f] probably also works here. But my personal faves are [name_f]Elfie[/name_f] & [name_f]Effie[/name_f] <3)