'gadzooks' (god's hooks) is pretty lame, as euphemistic interjections go. BrEng has given us 'gadzookery' as a term for the use of archaisms (as in a historical novel), which is why I chose to use it.

note: 'tushery' is another word which applies to this discussion, although it has even more of a negative connotation, being writing of poor quality distinguished esp. by the affected choice of archaic words.