Peugeot 206 CC - Punctures - rakman

My wife has a late 06 206cc. As everyone is aware these cars have no spare, just a can of

Emergency ''get you home'' . The car has 205/45/16 on alloys. I would like to keep a steel spare in the garage. I have tried to get a used 16'' wheel without sucess. There are plenty of 15'' wheels from 206's Can I use one of these with a higher profile tyre in an emergency.

Thanks