Visual Studio Project Installers - Can these just package assemblies and not build them

Question

I am trying to make some modifications to our build processes which ensure that our vdproj files do not execute builds, they just package already build DLL's from a given location.

Is there any way to do that using configuration settings to devenv.exe? Something like:

devenv /Project WebInstaller /Build Release /UseExistingDLLSFromHere "C:\DLLs"?

I'm aware I could use WIX to be more flexible, but unfortunately it's a legacy installer which we have to maintain.

Regards, Jamie