Use Natively-Compiled Stored Procedures in disk-based tables
Natively-compiled stored procedures can only reference:


in-memory tables
in-memory table variables / TVPs
in-memory natively compiled inline TVFs


Sounds like what you want is interop, and that can't be done inside a natively-compiled procedure. If it could, you would be discarding much of the performance benefits of the natively-compiled procedure.

This article is a couple of years old but not much about the core architecture has changed in 2016 / 2017:


The Promise – and the Pitfalls – of In-Memory OLTP