Custom datalayer for sylius

Question

We are currently trying to find the best solution for integrating sylius with our ERP system via REST api. What would be the best approach to replace the ORM layer and implement a cached API level? Many actions, such as creating a product, will be disabled because they are managed in a different system, so we need only some actions for recording, such as (order and payment). All other reading actions will take place either using elastic search or using the API.

Does every manager and repository replace the way to work or is there a better solution?

thanks