Stuff like this would work best in something like Rift's Chronicles system (allowing solo queue for guildhest-style content), but I don't know how overloaded SE's instance server is these days. That said, trying to reinforce mechanics by making the player do them to win doesn't work as well as setting a nebulous goal and telling the player to have fun. I think adding dummies that regen/lose HP at fixed rates to simulate DPS/HPS checks would be more effective at reinforcing the #gitgud habits you want people to learn.

edit: Sadly, I don't know how to create a dummy that makes tanks learn to #gitgud, because there's a whole lot of moving parts to being a good tank...