Advise on best approach for human language proficiency assessment

Hi all,
we are playing around with the idea to automate our need for language proficiency assessment. Background: we mediate employments across countries and the language level of an applicant is an important criteria.
No need for in-depth scoring (eg CEFR). A simple assessment (basic, good, advanced, etc) would be good enough. Doesnt need to be real time, could be based on an audio recording of a person speaking freely for a minute or two.
Any advice on how to best approach this? Thanks!
ah, the languages are mostly European

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