Hi,
The whole "lean method" was based on Toyota's lean product development method, so yes, growth hack and other online methods can be implemented with certain changes to offline service/product.
You're welcome to provide more information if you want further assistance on how to implement these methods in your specific product.
I've successfully helped over 300 entrepreneurs and would be happy to help you if you need. After scheduling a call, be sure to please send me some background information so that I can prepare before - thus giving you maximum value for your money during the call itself.