line items - use in workflows

We are loving accurate reporting of our MRR with deal line items - however, we have an annual CPI increase over several rolling months based on the client’s country. The only way to auto create a deal is when creating a client, and line items are not included as an option to set/create in workflows. We would be more likely to upgrade/bring on other HubSpot subscriptions if this functionality was possible.
Does anyone else have a workaround for this?