Welcome to the Launchpad :-)
ES400 is a Windows Mobile (Windows Embedded Handheld 6.5.3) device and the Browser engine included in the OS is the mobile version of IE 6. Not something that you can easily use to build a Cordova application. And, as far as I know, there's no version of Cordova supporting Windows Mobile.
I think that, at this moment, RhoMobile is the only way to build hybrid application for Windows Mobile, using our own WebKit based HTML5 rendering engine or using mobile IE6 included in the OS.
The cost is no more a device license, like in the past, but it's a developer subscription. You can find more information on RhoMobile website and ask here for more information. Just note that the license is needed to target Windows Mobile devices, the free version is not enough.