You can certainly raise the pitch of a didgeridoo and you are absolutely right in shortening the instrument. You can cut small slices (make sure its off the mouthpiece end), playing the didge in between each cut to check the key. You won’t need to take much off. Maybe start in half or 1cm slices. If it goes a little high, that will be ok as you can build the mouthpiece back up with beeswax. The most important thing though, is cutting the end off will make it more susceptible to cracking. Make sure you seal the exposed timber end well with a glue or varnish to stop any moisture leaking in or out.
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