How do I get my keyboard back?
It is possible to connect your device via USB to push an apk from the computer. There are a number of sites that allow apk files to be downloaded to a pc and file transferred this way. Search google for "android keyboard apk download" for an acceptable one. Once the file has been placed in a folder on the device, double click it to run "Package Installer" to install. You will have to enable the setting "Unknown Sources" in the security panel to install this way.