I dont have a definitive answer but RBBB can occur in the absence of any pathology, especially in young adults (sorry, cant see your age!!). In addition the hole in the heart you had can result incomplete RBBB and a significant number of people with incomplete go on to develop complete
I am not an AME but I suspect the CAA will wish to exclude significant underlying causes such as ischaemic heart disease. In the absence of these I am not aware that RBBB has been shown to have a significant risk of incapacitation. I hope this gives you some reassurance, and as always please let us know the outcome so we can help others