Complex Record Map non-batch?

I would need to build a Complex Record Map and then transform that into xml. But not the whole batch to one xml file - instead every repetition in that Complex Record Map would become one xml file. 

For Simple Record Maps this is easy to do because there are different types of Business Services that handle every record either individually or all of them as one batch but there doesn't seem to be similar options for Complex Record Maps? Instead, there is only batchtype business services.

Why is that? And what would be the best approach to transforming complex record map to several xml documents?