Can the rights of a declarant be conveyed to a non declarant?

Probably not, unless the declarant sells the entire project, including unsold units and un-built land to another developer.

In that case, then, another association-savvy attorney who represents the new developer would be involved in order to craft a new public offering statement that covers the new developer's -- new declarant's -- rights.

However, in your particular situation, you are best advised to consult with your association-savvy attorney who can more specifically answer your question.