Well, I found my answer!
The MBR95 is exactly what I need.
Wifi as WAN (WAW): One of the most exciting feature differences between the new MBR95 and the older MBR900 is the addition of support for WiFi as WAN (WAW). Simply put, WiFi as WAN means that the router can receive WiFi from an external source (for example, campground WiFi at an RV park, free WiFi at McDonald's, or even the hotspot feature from a smartphone like the iPhone) and create a private network that you can access securely through the MBR95 (either via WiFi or ethernet, however you like to connect to your router). Even if you have your own internet connection, the ability to use the MBR95 for WAW can come in VERY handy. WAW is great in the event of an unexpected internet outage - if your primary connection goes down and there is an open WiFi network in range, or if you have a smartphone that can be used as a WiFi hotspot (like the iPhone, EVO, Epic, and many others), the MBR95 can be configured to quickly connect to WiFi and your network will be back online in moments.