hi joris,
you might have seen it already and it might not exactly be what you want, but there is a complete factory reset function in the Zaquencer. if you hold “page <” and “stop/play” during startup, the complete flash memory is reinitialised, including the patterns and global parameters. you could use the sysex export function before doing that to save the global parameters and then reupload them once the flash has been reset.
after reset you could export just the empty patterns as sysex, so you can reupload them when you want to start from scratch. you can choose to store (and upload) a single pattern, a whole page, or all 192 of them.
hope this helps.
cheers,
christian