I haven't found a trace of nondualism - complete union via trance of the object with the subject - in Hasidism and Devekut.<quoted text>
Besides from arrogant, you are obviously wrong.
Google Hasidism and devekut, for a start.
If the practice found in Hasidism and Devekut culminates in the experience of nondualism, then the experiencer (sage) should become one with G-d in that state of the deepest trance.
Does Hasidism and Devekut say that the nondual experience results in perfect union in consciousness with HaShem after which the sage can stand up and declare, "I am HaShem"? No!
To declare, "I am HaShem" is a blasphemy in any variant of Judaism.
So, Judaism, in any of its variants, is stuck on the lowly level of dualism.