In Australia, we do not have what you would call 'ownership papers'. I adjusted my Rego paper to last my entire trip, this worked out well for me as I had planned on going to countries that did not require a carnet.
At the start, I was planning on brining my bike home. This did not worry me that my rego was run out, I always knew I could get another safety certificate and re-register it when I do return.
Other wise you can pay your Rego on line now, and get someone to send it over to you, or ask them to scan it in (both sides) and email to you. Then you only need to print it out.
For more information on my adventures, please visit either of the following: