We are using a Nintex Workflow to update a managed metadata field in a document library. We can not use the TaxonomyHiddenList because the metadata values aren't tagged somewhere yet. What we need to update the field value is the Term_Label|GUID. For the term below that would be OPG Voorl VS goedgekeurd|628f0e36-e559-4e67-bbda-3b549dd943cc.

Problem is that this GUID is different between farms. So here my questions:

1. Is it possible to retrieve the GUID from the term store on the farm the workflow is used?
2. Can you read the possible values that can be chosen in a managed metadata field in a list? When possible, I get them back as Term_Label|GUID and can set them in the managed metadata field.