As long as you stay in party in a dungeon, you are fine. The only bans are from people abusing the 60 second timer that auto hearths characters not in the party, but still in the instance. That sort of tagging is what gets people into trouble.
The EXP is greatly reduced per kill, but you make it up in volume. When I used to do this back in the day I used a 60/70 Prot paladin, but a Mage would have been faster. Just look up the lowest level a toon can enter an instance
https://vanilla-wow.fandom.com/wiki/Instances_by_level (Scroll down to the "simple list" portion which shows the lowest level to enter in parenthesis such as RFC which is (8).
My favorite type of dungeons for this is ones where you can leave the lowbies near the instance portal, and then pull the instance to within XP range. The Deadmines isn't too great for that, but you take what you can get usually. Scarlet Monastery is good for this, especially in Cathedral, you can pull the end boss, and he aggros the rest of the instance.
Edit: What I plan on doing, is to just make whole teams of fewer classes, to simplify class quests while leveling. Doing 5 shamans, 4 mages and 1 priest, 4 warlocks and a priest, 4 warriors and a priest (priests staggered on another account) Then, I plan on making a "filler" group which has all the classes I am missing 1 or 2 of, so it will be Warrior, Warlock, Mage, and 2 priests. Then I have 5 each of Shaman, Mage, Warlock, Priest, and Warrior.
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