So my friend has an old spanish road bike and he wants to restore it.
By restore I mean make it nice looking and usable.
THe bike is an Ortera and the all the bits on it are made by a Spanish company called zeus.
Now my friend wants to get a new wheelset for it and he would like this wheelset to be all black.

Now I´ve got some questions. I'm guessing if he got a black wheelset somehow it would not be compatible with his old derailleurs and all that. Would he have to buy all new parts? Is all black wheels even feasable when dezling with vintage parts?
What are the options?

THe derailleurs he has are usable But theres some cracks where they attack to the frame and so i feel as though they should be replaced. How cross compatible are old groupos, if he stuck with his current wheelset could we put on some shimano derailleurs or something? What are the options?

He knows next to nothing about bikes and I know nothing about classic/older bikes.