When a company reaches a certain size their expected to have certain things just because other successful companies have them.
If the fired the team that writes, publishes, and distributes the company newsletter where I work, no one who does any real work would notice or care. The fact that we have a newsletter makes our company seem more big and successful to investors though.
If they're really short-staffed, they shouldn't be wasting their time beating around the bush. Additionally, texting is too slow, I would just call them to get an immediate answer, so I can move on with planning how the rest of the day/shift will go.
"Hi {name}, would you be interested in coming in today to pick up some overtime?"
Simple yes/no, directly to the point, and frames the question in a (potentially) beneficial manner to the employ.