Actually, why not to use normal channel msg? If this “message” is interesting to a group of users, sending it to channel will prevent same future requests for some time.
p.s. as example:
If this is like: “!my_points” - sending a 5-users-list of points for 5 users isnt looking “good”, you need to send only 1 user`s points to a single user, so you need 5 different messages to 5 different users. And if its like “!song” - better to announce it once on channel rather then sending a single message to each user who requested it.