You can machine an 11 speed hub to fit.
Looks like this user on time trialling forum might be able to help: http://www.timetriallingforum.co.uk/index.php?/topic/131800-11-speed-cassette-conversion-to-fit-on-10-speed-freehub/&page=2
Never used so can't comment on his work.
Thank you for your answer. I'll try to find a place in my town where I can machine out a few millimetres out of my cassette and hopefully someone to help me :D
@BunkMoreland started
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You can machine an 11 speed hub to fit.
Looks like this user on time trialling forum might be able to help: http://www.timetriallingforum.co.uk/index.php?/topic/131800-11-speed-cassette-conversion-to-fit-on-10-speed-freehub/&page=2
Never used so can't comment on his work.