Muzza,
There is no way, without a complete re-write of the software, of achieving what you want. WHS actually only saves individual clusters into a 4Gb file; this file can include backups from different computers and only the pointers give an indication that a particular cluster is for example, C/Photos/Muzza.bmp.
As this is a 'backup' system, there is no reason why you shouldn't delete all backups and start again, it's designed as a disaster recovery system, not to recover individual files on a regular basis. If your client computer is now running OK, running a new backup would be quick and easy.
Colin