Store Consumer Credentials in DB Less Mode

We have multiple teams and each team has their own dedicated Kong (OSS) instance. All Kong instances are deployed in a DB-less mode. We need to create consumers which can be shared across all the Kong instances (Note: All the instances are deployed in a DB less mode ie. stateless) and also store the consumer in a secure manner.
Looking out for ideas on the possible solutions to achieve the above (Trying to avoid Kong DB enabled mode). Can I use Vault to store the cred and fetch those at runtime
Thanks in advance!!

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