One simple solution is to simply pre-process all files before compilation, detect the OnPropertyChanged calls that are defined in set { ... } blocks, determine the property name and fix the name parameter accordingly.

You could do this using an ad-hoc tool (that would be my recommendation), or use a real C# (or VB.NET) parser (like those which can be found here: Parser for C#).

I think it's reasonable way to do it. Of course, it's not very elegant nor smart, but it has zero runtime impact, and follows Microsoft rules.

If you want to save some compile time, you could have both ways using compilation directives, like this:

set
{
#if DEBUG // smart and fast compile way
   OnPropertyChanged(() => PropertyName);
#else // dumb but efficient way
   OnPropertyChanged("MyProp"); // this will be fixed by buid process
#endif
}