Easy fix there is to just use someone's rank, or rank & name.
Yeah, it's not life or death. Mostly a pet peeve [like CD1 or LT(Navy)].
To be a bit pedantic, I'm not sure if it's approved by the TB for signature blocks? Then again not many people follow those rules (including all ya'all with fancy quotes and pictures).
To be really positive spacey, when members are pressured (or ordered) to have pronouns in their signature block it may be uncomfortable [non-inclusive] for non-binary members who make a point of not using pronouns, including they/them.