In order to use the browser, you need to do the gconftool step (as shown in the script) to set the default IAP to DUMMY. Then, you select "DEFAULT" as the connection type in the wireless connection widget. That shuts down the wireless interface and allows the browser to access the net via the USB adapter.

Finally, I found a pre-wired micro USB On-The-Go (OTG) cable on Amazon Marketplace (from Bright Light Business) that works fine. However it is pretty long (3 meters). The cable is: Cables Unlimited 3 Meter USB Micro A Cable with Ferrites (USB126003M)

So far, the N810 seems to be working fine on battery power with the TRENDNET adapter.