Rasterizing PDF vector objects - Acrobat

I need to rasterize vector objects in PDF files, possibly with Acrobat. I need to rasterize only vector objects, not text.

I've tried separating PDF layers in multiple files, printing vector objects as images and then recombining the PDFs but the procedure is too complex, heavy, bugged and slow (sometimes I have to rasterize 1000 pages at once).

I've tried with the flattener preview. If I set the raster/vector slider to 0%, Acrobat rasterize all, also text, and I don't want it. Am I missing anything?

Is there any other procedure available?

TY