Bent the inside pins of my 72 Challeger key ignition.. now my key won't work, Im in need of re-placing the ignition lock cylinder

Locksmith seems to think I need a whole new ignition lock cylinder with a different key

Question is are these still available and how much work is taking the steering coloumn apart to re-place this, Does the steering wheel need to be pulled with a special tool?.. has anyone done this job, to help me with info?