LISP - editing Entitiey within Blocks

Hello there,
I'm trying to figure out a LISP-routine, that is supposed to walk through the block list and explode any possibly included polygone mesh polyline with ist 16-flag set) completly without any user interaction.

Someone on "The Swamp" already gave me a routine that would work perfectly, if BricsCAD knew the bedit command AutoCAD uses.

Does anyone know a BricsCAD alternative for bedit?

If not then: is there a proper way to hand entities to refedit via their entity names?

If not: Is there a possible solution to my problem (exploding certain entities within a block), that doesn't make it nessecary to explode every insert in the drawing?