I would approach this with an Add-in using SolidWorks Events.
You could trigger a dialog box or notification using the swAppFileOpenPostNotify event.
I didn't see any quick and easy way to do it with macros (although I suspect there is one..), and I realize you preferred not to use them anyway. If you have to resort to macros, maybe there is something here that will help:
Alternatively, can you create a sketch that has the text "You are working on a part with configurations, please review them for more details" and place the text above the part as a title like this?