Rollercoaster Neck

[Nibody]

I picked up cheap carcas of  a set neck Chinese bass (of the variety that makes Mr Hall very unhappy). Bought it in full knowledge of the neck being shot.

The question is what is the best way (aside from a bonfire) to try to sort this?

The truss rod nut is pretty stripped so I really need to take the fretboard off if I replace it - do I look at planning the neck, try fixing with heat, plane the fingerboard (I hate doing fret replacement!)throw money at it by taking it to a pro luthier (its more of a project for me).

For clarity when I managed to get the truss rod to work the bass side straightened (it had been tightened into a horrific back bow) but the hump remained on the treble side. 

I have done some minor luthier stuff before (replace frets, replace trussrod) on other instruments though I am by no means an expert. The bass was cheap so I don't want to throw money at it at this point in time.

 

[Nibody]

Also there does seem to be a slight twist in the headstock backwards to the treble side relative to the body but I think judging by the cut for the nut this has always been there.