SAP PI REST to BPM intermediate message event (SOAP WS-RM) Scenario

I have a requirement to send a message to the BPM process that resumes the process. As an entry end point, we need use the synchronous REST adapter.

I was able to implement the transfer of a synchronous REST call to an asynchronous interface using

Sync SOAP to Async Target – Send messageID back to source as response message (Without BPM)

It works fine. But there is a sync interface in acync mode in this scenario (with dummy out). But when we use BPM intermediate message event, we must use async interface with reliable messaging.

I could not find a description of such a scenario. I would be very grateful if someone shared the information.