Hi Keith,   If it fits on the hub it should be OK as a get you home.  Those blow up kits do work on an ordinary or slow puncture, but on bad blow out are not to be rely used, so a spare, in my opinion, is essential.   It might be worth having a look on ebay or a a breakers site to see what is around.  Having a proper spare is a good selling point.   Regards,   Peter.