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How to persuade C fanatics to work on my C++ open source project?

I am launching an open-source project into a space where a lot of development is done Linux-kernel-style, i.e. C-language with a low-level mindset. My project is broad and complex and uses aspects of the C++ language and libraries, including the Boost library to best effect for simple, slightly syntactically sweetened, elegant and well structured high level code. We are using C++ templates too to avoid duplication of code and for static polymorphism in code specialisation for performance.

Many of the experts in this field are well used to pure C-language projects. How can I persuade them to contribute to my idiomatic C++ based project?

I have no objection to C-language subcomponents or the use of a C-like subset for parts of the project so that might be part of the answer.

This is a rewritten and retagged rehash of my previous question that was closed. Apologies to those who read and answered for it not being constructive. I hope this new question is viewed as constructive. Please note that this is not a language advocacy question and please keep answers in that spirit.