That is the way to do it. And IMO it should extend to all business communication. I hate getting "hey" in my DMs with no other context. Like...."hey? whats up?". Just get to the point, the day is too busy for this.
When I message someone on Slack, I usually do something like "Hey! I was wondering if you could help me with..."
There's no need to add an extra blocking factor with this.
There's a manifesto for this: https://nohello.net/en/