Can the camber be set by a man at the wheel alignment place while the tracking is sorted or is it very difficult to do it quickly?
its important to understand the the differant levels of set up needed for various vehichles. Most small cars only need or have tracking adjustment. So this basic adjustment can be done by most small tyre fitting companys. However the Omega is not a small car and is very sensative to camber and tracking settings. With this in mind clearly your normal run of the mill tyre fitter is not equiped to set it up correctly, more than likely they'll make an arse of it tbh.
So as mentioned, visit Wheels in motion, either on the web in person or ring them for a chat on the subject and get an idea of whats involved. You need full geomotric set up on a hawk eye rig or similar. Camber caster and toe can be set at the front and toe on the rear as part of the complete set up.
Merely setting toe(tracking) on its own is a complete waste of time and money as it needs to work in conjunction with the othet settings.
So as said, set the camber as best you can to save your tyres from wareing too much until you can the car to a set up bay. hth
ps helps to include your rough location in your profile, we can then direct you to any services you may ask about. Wheels in motion are in Chesham.