simulink coder tunable parameters

I'm curious if there is a way to change tunable parameters within auto-generated c code without recompiling and restarting the code.

I have a control system running on an embedded platform as c code which may require many parameters to be tuned. I'd prefer if this could happen without integrators, filters, memory blocks, etc being reset. Any ideas on how to accomplish this easily? Clearly I could make the tunable parameters inputs to the system but this would require a large re-architecting of the current implementation.

Thanks.