Are they actually non transferable or are they required to give the right of first refusal to the company? If they are non transferable at all, what limitations are there? Can you transfer them in bankruptcy or divorce?
Probate transactions allow for a transfer typically (and they may allow for a very few specific other cases such as covering tax on your options by offering a buyback for some portion of them), but otherwise, there is absolutely no transfer allowed unless the company's board allows it.