Modifying processInstanceId pattern

My company uses an external platform as data entry for sales report.
As soon as a sale is completed, the external platform initiates Camunda so we can proceed with the flow.
To keep track of each sale we’ve decided that the processInstanceId is the best variable to use as businessKey.
Problem is: the salesperson needs to keep that key and use it again later but they’re finding it inconveninent for such complex key.
Is there a way we can set up another pattern to processInstanceId?
Preferably without having to recur to the database.

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