Migration of workdrive attachments from one Zoho CRM to a new Zoho CRM

Migration of workdrive attachments from one Zoho CRM to a new Zoho CRM

We are currently trying to split a Zoho account into several new separate identities. In our source CRM, we have around 6000 attachments which are workdrive links to files. Zoho has said there is no way to migrate these to the new instance. This means manually relinking up to 6000 files. The CRM migration tool is fine for attachments like pdf or docs but does not migrate workdrive linked files.
Has anyone else done this and has any suggestions? Thanks :)