Anyway who say sidewall cannot be repaired?  Until today still hear this rubbish.
Unless it is a big long tear, nowadays inner tyre patch type & adhesive used is quite advance.

Still hear this type of fear mongering by tire shop that sidewall cannot patch if normal small hole. 
If you are not a hardcore driver, basically it still can be use for normal road after doing inner patch type.
Been doing for years and most of those big tire shop especially can do lorries, 4x4 got many types of inner patch from small to big size and also adhesive to hold & secure the patch from leaking.