Dutchy, it depends on whether you're sure you managed to get all the old oil out. If so, adding exact Specified Volume of New oil should be fine. If not, then you now have more oil in there than Spec... depending on how much more you could Experience Hydraulic lock, Although I doubt that. Depends on how Long you let it Drain and whether you pumped to get most of the old oil out.
As far as the air in the rod sorting Itself out, yes, It will.
The big question is how much old oil was left in there.
A wire Coat Hanger or Other Length of wire is great for fishing out the damping rod.
I reckon you'll be fine Regarding lock nut and Lower bolt. They aren't going anywhere nor can anything really come undone given the hermetic set-up.
You'll only Know if Lower bolt is Loose if you start Losing oil through there. Check for leaks regularly. If your Model had Preload adjustment you might Notice it Turns to no effect but this is not the case.
If you crash and burn I accept no Responsibility