H815 USA Any working root + TWRP installation method ?

I have an LG H815 USA version. I have updated to MM using KDZ and LGUP method. I am not rooted and I can't seem to find a method to root and install TWRP on this device. All methods require "Unlocked bootloader" but H815 USA does not have an unlocked bootloader (not yet ).

So how do I proceed ? is there a method ? maybe downgrade back to LP and there is some method for perm-root and custom recovery installation ?

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