@PvanderValk as of now, leads can’t be exported and re-imported. Anything process that involves exporting would rely on the association to the contact object - which might cause issues if it’s not always a 1:1 association or if there are company leads.
If you do want to go this route, you’d have to create a custom report on contacts and leads, export that report, clean up the file for editing, create a custom property on the contact object for disqualification status, re-import the contacts, create a workflow that copies that value from the custom contact disqualification reason property from the contact into the associated lead. It’s possible but in my opinion a lot more prone to error than updating a handful of leads directly in HubSpot.