Unbolt the whole steering column with the mechanical part of the lock. You will need to cut grooves in the 'head-snap-bolts' to turn them after you release them with a small chisel. Easier than it reads, I've done it. Bollts can be replaced with Allen cap head type. Once it is out you can engineer the release of the unit and repair as required.
Good - Fast - Cheap: Pick any two.
3 x E32 735iL (Alpine White, Glacier Blue & Kashmir Beige); 2 X E38 735iL (Oxford Green & Alpine White); E53 X5 4.4i (Pearl Beige); R50 Cooper; R55 Cooper Clubman (Both Pure Silver).
E38 Parts Car
E21 318i; E23 735i; E30 318i; E32 735iL; E34 535i; E38 730iL; E53 4.4i
I've just changed my wiper blades and now my reverse lights don't work. Should I change my fuel pump relay?