I found an interesting fact about Hong Kong & spare tyres. Having spoken to Sobe and Peter J previously it's extremely rare for HK residents to change their own tyres. They rely on their breakdown services to come out and do it for them.
From that basis, having a spare wheel really doesn't appear to be an issue.
I want to remove my spare and wheel carrier to save weight. I've had the aggro of trying to fit the 18" wheel on my passenger seat when it rapidly deflated mid corner. Its the original spare as well, so well past replacement I would imaging.
Not much room for a passenger! BTW, if you have to do this make sure the tyre is fully deflated for safety.