I confused your original question
Support files and setup dialogs theme are part of a patch build and this files inclusion can't be removed at build time.
What you have done is correct, these files can be added to Creatives list or to Support File list (MSI view).
Actually, The only option that you have, is to create a clone MPR project file (with the identical set of scripts/etc.) but with the modifications made to the dialog files/support files only.