Hi,
Unfortunately that's not possible, because CleanMart already works based on overwriting files.
(CleanMart overwrites Virtuemart core files)
Overwriting overwrite files doesn't make any sense.
TIP: when you create a topic, don't post a reply to your own topic, because when we start providing support, we start from the oldest unanswered topic, by adding a new reply to your own topic would bring your topic to top (to newest). If you want to say something extra, instead of replying your own topic, click the "Edit" button and edit your initial post.
Regards.