AWS Cognito Identity Provider Emulator for offline development

I am looking for an emulator which partly covers the API (AdminCreateUser, AdminGetUser,…) and saves the internal user objects in a given dynamodb database. This would allow to use any aws sdk provided with a new Endpoint targeting emulator to be used.

Has anyone started a serverless plugin or external server to solve this problem? Usage should be similar to serverless-offline.

Thanks
Andreas