How to customize open-source Appsmith to enable inter-app communication without Enterprise features?

I’m using the open-source version of Appsmith and have two apps (App1 and App2) embedded on the same HTML page using iframes. I want these apps to communicate with each other, such as by exchanging data or triggering actions, similar to what’s possible with the Appsmith Enterprise feature for custom messaging integrations.

The Appsmith documentation on messaging covers inter-app messaging, but it’s limited to the Enterprise version. Since the open-source version allows customization, I’m exploring ways to implement this functionality by modifying the open-source codebase.

Questions:

1.  Is it feasible to modify the open-source Appsmith code to create a messaging layer for inter-app communication?
2.  Has anyone implemented cross-iframe messaging or postMessage functionality within the open-source version of Appsmith?
3.  Are there any specific parts of the codebase I should focus on to add this functionality without requiring Enterprise features?

Any guidance or pointers to relevant parts of the Appsmith codebase would be very helpful!