Integrate splash guard strips with old concrete chunks around the house?

Hello,
I still have a large amount of concrete debris (medium-sized chunks) from a former wall. Since I don’t want to dispose of it, I thought that I could integrate it into the splash protection strip around the house. For the appearance and the better properties, I would then fill the top 10cm with the usual gravel. Would that work?
I would also appreciate further information about the splash protection strip. For example, is 80cm necessary or would 60cm depth be sufficient in Berlin (higher temperatures)? Should a fleece or something similar be placed at the bottom? Otherwise, I could imagine that the stones might sink into the soil over time in connection with the rain.
I also keep hearing that a studded membrane should be placed against the house. The construction company said that the current building foil would be sufficient. The construction of the basement wall is 30cm reinforced concrete, bitumen paint, 10cm insulation and the building foil, then the surrounding soil or clay soil.

80cm depth for the splash guard strip...?

Ours was maybe 30cm...a fleece was placed there...then brownish gravel (?) and above that pebbles...

Concrete residue seems rather questionable...the savings should not be particularly large:

*** Eventual position ***

1. 07 Eaves strip as splash guard total width=35cm,
with graveling and lawn edging stones, gray,
installation on existing planum

per running meter = €19.61 net

The 80 cm is about frost protection. In my splash guard strip, there would also be basement windows integrated, which would also have a small light well. Just because I saved on the depth of the splash guard strip, I don't want a flooded basement. The downspouts would also be located in the splash guard strip, and under certain circumstances, the water could back up and spurt out at the downspout. In this case, it would also be advisable to have enough depth in the splash guard strip so that the rainwater from the downspout can first collect there. The mentioned clay soil also has a negative effect because the water penetrates only very slowly. But it's not about all that; it's only about whether the concrete chunks (allegedly lean concrete) could somehow have a negative effect. In this regard, I had thought that the chunks might be too sharp-edged and could cut into the foil/ dimpled membrane, or that the lean concrete might absorb water or not dry as quickly (not like the gravel) and could thereby lead to decomposition processes and associated odors.

The water should be able to drain. That would not be guaranteed with chunks. It does not have to be frost-resistant. 20/30 cm is enough. It is a SPRITZschutz ;)

Aha, why should that not be guaranteed with rubble? The rubble does not seal anything tightly and there are likely many cavities in between. So why is drainage not possible? And yes, it must be frost-proof I think. Because it does not serve exclusively as a splash guard.