Probably the same as D:OS, where it was certainly possible to get to Luculla at a low level (and likewise from there to the Dark Forest with a bit of creativity), just not very advisable.
The key difference is that if you go to Luculla too early, you could go back to Cyseal and scoop up the XP you missed. You can't go back to the Island of Appropriately-Levelled-Enemies in this game.
