It should be quite possible to convert WBSF backups to a common ISO image using the Wii Backup Fusion software.
Convert Nintendo Wii backup file system data to CD/DVD/HD DVD/Blu-ray disc ISO binary image.
We have found 3 software records in our database eligible for .wbfs to .iso file format conversion.
Microsoft Windows software - convert wbfs to iso on Windows
Wii Backup Manager is a simple too for for CISO to ISO conversion.
Convert from wbfs file
to iso file
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned wbfs to iso. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Wii Unscrambler is simple to use tool for Microsoft Windows that allows users to convert WII, WBFS and CISO images to ISO disk format.
Multiplatform software - convert wbfs to iso on any platform
Wii Backup Fusion is a package of useful management and conversion tools for Wii Games.