Substitute instance in netlist with wrapper

Hi all,

I have a netlist with an instance of my rtl. As verification engineers we often find the need to add some (systemverilog) interfaces next to the rtl and the way we do it is to modify the netlist with a wrapper instead that instantiate the rtl and our interfaces. 

I actually believe that the same can be achieved by using the verilog configuration mechanism without altering the netlist but keeping the wrapper and the rtl in two separate libraries. Unfortunately I'm having issues and it seems it doesn't work. 

Anyone here has a reference or a suggestion?

Thanks a lot,

Al