Another method here.
But first, some back story:
I integrated a system update using Titanium Backup on my coworker's tablet which broke the stock Google keyboard. This wouldn't have been a problem if poking around the recovery menu didn't also stupidly wipe the thing without so much as a confirmation. Yes, "Vol Up" = "Make Selection" instead of "Move Up" and there was no confirmation prompt so I accidentally picked "Wipe eMMC" and was immediately greeted with "Formatting eMMC." All I wanted to do was look for some cache clearing options and pressed Vol Up to *gasp* see if I could move UP the menu (Vol Down moves down and I expected power/lock to be "Make Selection").
Anyway, I had made a backup with Titanium Backup Pro when I first rooted his tablet (Verizon Ellipsis QMV7A) but it wasn't much use without a file manager and there was no way to use the browser or Play Store without a keyboard. There's also no ROM available, stock or otherwise.
I didn't have a USB OTG adapter or a Bluetooth keyboard, but I did have my Galaxy Note 3 and the tablet did have Bluetooth.
I paired them without needing the keyboard and initiated a file transfer to send a keyboard APK. It worked beautifully! I enabled alternate sources for APK installs, installed the keyboard, installed Titanium Backup, and was good to go! Of course, I then integrated it and a file manage into the ROM with Titanium Backup Pro.