You can update Qr code redirect link just by chaning your {Link url} (in this example redirect field) value.
Let’s say you want to stop using fillout form and want to use Aeropage dynamic website.
I will use url on aeropage dynamic page as a formula
Paste this to airtable, make sure to remove last part(record id) and make it dynamic
Now without any change to the existing documents, Qr code will redirect using new value (in this example to the aeropage builder website)