Using FireDac's onUpdateRecord and optionally execute default statements

Question

I have a query that returns rows with an outer join. This causes records to exist in the results that don't really exist in the table. When those rows are changed FireDac sees the change as an Update instead of an insert. That behavior makes sense from FireDac's side because it has no way to tell the difference.

I am overriding the OnUpdateRecord event to catch those rows that are marked wrong and perform the insert myself. That part is working great. What I can't figure out is how to tell FireDac to perform it's normal process on other records. I thought I could set the AAction to eaDefault and on the return FireDac would continue to process the row as normal. However, that does not seem to be the case. Once OnUpdateRecord is in place it looks like FireDac never does any updates to the server.

Is there a way to tell FireDac to update the current row? Either in the OnUpdateRecord function by calling something - or maybe a different return value that I missed?

Otherwise is there a different way to change these updates into inserts? I looked at changing the UpdateStatus but that is read only. I looked at TFDUpdateSql - but I could not figure out a way how to only sometimes turn the update into an insert.

I am using CachedUpdates if that makes any difference.

Here is what I have for an OnUpdateRecord function:

procedure TMaintainUserAccountsData.QueryDrowssapRolesUpdateRecord(
  ASender: TDataSet; ARequest: TFDUpdateRequest; var AAction: TFDErrorAction;
  AOptions: TFDUpdateRowOptions);
{^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^}
begin
  if (ARequest = arUpdate) and VarIsNull(ASender.FieldByName('Username').OldValue) then
  begin
    ASender.Edit;
    ASender.FieldByName('RoleTypeID').Value := ASender.FieldByName('RealRoleTypeID').Value;
    ASender.Post;
    MGRDataAccess.ExecSQL('INSERT INTO DrowssapRoles (Username, RoleTypeID, HasRole) VALUES (:Username, :RoleTypeID, :HasRole)',
                          [ASender.FieldByName('Username').AsString, ASender.FieldByName('RoleTypeID').AsInteger,
                             ASender.FieldByName('HasRole').AsBoolean]);

    AAction := eaApplied;
  end
  else
  begin
    // What do I do here to get the default FireDac actions?
  end;
end;