No, there really is no "special" oil or wax for bokken.
You don't need one.
One of the problems with weird/exotic woods is that they sometimes DO need "special" care and handleing.
Some woods polish up to nearly a "glass-like" finish, and they can sometimes be almost as fragile.
(when I have some time I'll tell you about a buddy of mine that used a very $ $ $, polished length of antique ebony for paired partner practice
---or the guy that used a grade of walnut usually set aside for fine furniture to make a bo staff--looked cool---but so NOT worth the price.)
Do yourself favor and stick to the normal white oaks and ashs and hickorys.
Its not about the "wood" its about the training.