You may check the manual of each router if one of them supports DD-WRT.
If you can flash DD-WRT
firmware on your router, then you may convert it to a wireless bridge or repeater.
Be very cautious though you might brick your router if this is not properly done. Have a read here
You'll have a better wireless coverage by using bridging or repeating than AP (from my own experience). Yes, they will still require to run network cables. :grin:
Also, modern routers have bridging or repeating features - again check the manul of your router.