If you want to do the raid as intended then you have to put together a raid group like people did when it was new. You can't expect to clear end game raids with first timers who don't watch guides and don't talk in voice chat, which is what you'll find in RF and DF. Many random groups can't even do extreme trials within the duty timer. That's why there are practice groups for different phases.

Putting Coils in the raid roulette will not accomplish what you want. It will not allow your friend to clear the bosses one by one with competent people. Instead, your friend will see dozens of groups fall apart until he gives up, and many players will have their roulette queue wasted on this.

So, please make a raid group. There are discord servers where you can find like-minded players.