Is there any route to 'Euporia' without killing main bosses? Or is it locked behind plot?

[Fried Noodles]

I've been holding off on taking on some bosses. I learned of an interesting weapon that I'd like to try, but it appears to be in a later area of the DLC.

[Nauct]

You gotta kill Mesmer to get there

[j0eltinn]

U need to kill the dancing lion, messmer and the boss in the ruins of rauth.