Hi Sven,
I don't know of an ABAP method for your use case, however, deletion of HANA content (if you have the right authorizations) should as well be possible using native SQL.
However, I would not suggest to do so. The HANA content is created and the lifecycle maintained via the HANA Modeler (respectively HANA Development Tools) and deletion via native SQL from ABAP might miss some dependencies. Therefore, I'd rather suggest to delete the artefact where you typically maintain/create it, i.e. the HANA Modeller.
Especially the deletion of the runtime artefact in _SYS_BIC is critical, as this leads to an inconsistency between the catalog and the content in the database.
Cheers,
Jasmin