Undelete vmdks is only possible when you take precautions on a daily base.
There is a better than zero chance to recover the vmdk when all of this conditions are fulfilled:
- the vmdk was thick provisioned
- the vmfs volume was fresh formatted not to long ago
- the vmfs volume was not too full
Given your statement that the vmdk can be reproduced within less than a day of work I would go that route.
If you like I can assist with the recovery but unfortunately that would have to wait until tuesday