Are there any words in English other than friend where the spelling "ie" corresponds to the "short e" sound /ɛ/?
Not any common words other than ones containing friend, such as
the open compounds
boy friend, etc.
I guess you could try to recall if your friend is hygienic. Otherwise, a friend stays until the end. There is also the surname
as in the baseball player Bob Friend.
Lieutenant (in British English)?
A British English pronunciation of the word lieutenant starts with /lɛ/: Collins gives "lɛfˈtɛnənt". This could be seen as a word where "ie" = /ɛ/. But this correspondence is not present for the American English speakers who use the pronunciation " luːˈtɛnənt".
Hemielytron (in American English)?
I think it's just a mistake, but the Collins website gives "hɛˈmɛlɪˌtrɑn" as the American English pronunciation of "hemielytron", and defines it as
alt. sp. of hemelytron
Personally, I would always associate the alternative spelling hemielytron with the alternative pronunciation /ˌhɛmɪˈɛlɪˌtrɑn/, but it's not a word that I use, so I can't say for sure whether anybody uses the spelling "hemielytron" and the pronunciation "hɛˈmɛlɪˌtrɑn" the way that Collins suggests.