IDES is perfect for bending the things your ways. SCN is wonderful to see different scenarios and their mapping in SAP. You have both in your reach. Now coming to your phobia for interview, as you asked what can you do. Im sure you would like to switch to SAP MM consultancy, but for a stable career.
To overcome it, try with contractual job offers. You would not want to go for such profile but surely can take interview calls to get rid of the nervousness. You must have your profile in job portal websites, find and apply for such jobs without giving a second thought (those matching your profile).
Give 2-3 interview to see what the industry demands and what kind of questions they ask. Probably you wouldn't to able answer all questions but you'll at least get to know what to expect and where to practice.
You don't worry about failures but surely enhance yourself for big stage i.e permanent job profile this way. I have seen people trying out this method and succeed.
All the best !!
ntn