1
If your wireless keyboard is not working on the blue Bitlocker Key screen, the on-screen keyboard cannot be initialized on that screen, the only option is to gain access to a wired keyboard to be able to enter the Bitlocker Recovery Key.
2
If the drive that is encrypted is the C drive, then you cannot use the 'Skip this Drive' option.
3
If you are still unable to get into Windows, are you able to force your PC into the recovery Environment, and if so, is your keyboard working in there.
Start your PC, just as Windows attempts to load (spinning dots), press and hold Power Button for 5 - 10 seconds to perform a Hard Shut Down
Do this twice
On the third start Windows will boot into the Recovery Environment and from there you can access System Repair, Safe Mode, Command Prompt... etc.