[uberman]

It can be difficult to present yourself as a consultant when a client does not use a toolset you are familiar with. Focus on what you bring to the problem domain. A pertinent set of architectural skills and perspectives that your client can leverage. You an an expert in this domain with experience that transcends platform specifics.

Alternatively, if your skill set frames you as more like a contractor who is a great programmer and not a consultant, then you are likely SOL as your client is likely looking for a programmer who can hit the ground running with their platform.