I don't think so. But you'll have a challenge on your hand, which is fun. Just save beforehand, in case you realize you can't do it.
Example of early challenges:
1) Attacking the magical organism in Torta with just Deathpolca and Lily Killer (just after killing the white phantom) – when I did it, I had to consume 5 or 6 Revivers to manage it.
2) The Torta jail EX dungeon: it really helps if you played the gacha in Doremi Fuckingdom; the whip for Deathpolca, the anal plug for Ange. Even then, the final boss of the EX dungeon is very, very hard at that point. Ange is not yet strong enough to take all damages. I believe the best way to deal with it at that point is the equip Demon Claws (two attacks on each enemy, raises TP faster), or Sludge Dagger (enemy weakness, but raises TP slower) for Deathpolca, and have Ange cast Sleep over and over. Even then, Revivers (or Soul Spirit Stones) are your friends
The EXP you gain here, you would have gained anyway a little while later, after which point it would make no difference on your level relative to enemies.