We may not like it, but as computer programmer we have to have a CV that agents and HR departments are willing to forward to project managers. Our CV must also stand out as matching the needed still set within 30 seconds of someone looking at it, it must also have the correct keywords to it matches a search of the cv database.
So just working in a unique programming language is a great risk! However using a mix of the DSL and a main stream language can be presented well on the CV. (You must tell the truth on your CV, but it does not have to be the whole truth!)