Dataflow record deletion

Hi,
Just to start off, I'm not keen on doing physical deletes but we have a need to carry out ad-hoc deletion of individual records after they have been loaded into a dataflow and I'm looking for a workround to do this.

Currently I have an incremental load that runs to keep a dataflow in sync with a Sales Opportunity table on SQL Server. 

Occassionaly, a record is physically deleted from this table and the Opportunity ID is written to a separate table for audit purposes. 

What I've tried to do is to use the audit table as a left anti-join to filter out the records in a Transform and then use linked dataflows so I can load the audit table (daily), the Opportunity Staging (half-hourly) then the Opportunity Transform to follow. 

So that the Opportunity Transform follows the Staging dataflow, I've set up a Power Automate flow to trigger the dataflow refreshes in sequence. All this is going through our on-premise gateway.

If I refresh through Power BI its fine but using Power Automate it is hit and miss and I often get the message "The backend request failed with error code '400'" which I'm struggling with. 

I wondered if there's a better way of removing individual records from the Dataflows as the only way to be sure is to manually re-load the historic data which is not ideal. We've found the Dataflows useful for reporting as this gives us much better control than direct access to SQL so would like to keep the cloud model. Just wondering if other tools such as data factory might give us more flexibility ?

Unfortunately, I haven't been able to test this yet as a pipeline using Fabric (instead of Power Automate) because I'm waiting for our gateway software to be updated.