Flow Screen Component: Dependent Picklists with RecordType and MultiSelect Picklist support by Narender Singh
Narender Singh created a flow screen component for a dependent picklist tha supports picklist value selection based on the record type.
https://forcepanda.wordpress.com/2019/06/11/flow-screen-component-dependent-picklists-with-recordtype-and-multiselect-picklist-support/