A good introduction to the drifter ships would be to make a “single player doable” drifter missions with respective difficulty and add them to the list of missions that the mission agents lvl 1-4 give, so people can learn how to fight the drifter ships, without the need to form fleets, watch videos on youtube read some third party webistes, and in general to diversify the mission content then, later once they feel comfortable they can join the group events to earn better rewards.
You don’t have to create ALL brand new missions just for them you can simply use the same old missions with the Drifters being the enemy factions, so instead of Serpentis/Angel Extravaganza, there is a drifter version, or the Blockade, Vengeance, or whatever missions you feel that should be added.
This could be extended to all the other factions that were not part of the enemy factions for the missions like the Triglavians and whatever factions you decide to add later in the game.