Thank you! I appreciate it!I though this was another of the I want to use my antique router posts but that is a very fancy router to use a stupid nic card.
Still I think the answer is still the same it does not appear to have the feature you need. I only did a quick look so maybe it does.
It needs a feature that allows it to act as a end device. This is normally called client-bridge mode. Many device that have this ability can also function as repeaters but some call this extender. I do not think that router has it. In fact I saw notes that it does not even have the other form of bridge mode called AP. This would the reverse of what you need even if it had it.
Now maybe dd-wrt supports this but you are quickly making a very complex solution for something you can just buy a nic card to solve.