netherrack_replace_blobs replacement question

[Geph]

Hi Misode! Thank you so much for creating the 1.16 -> 1.17 upgrade utility, it saved me hours of time trying to upgrade an abandoned pack. That said in the process I ran into the following notification:

Feature "netherrack_replace_blobs" no longer allows values above 12. Consider increasing the count of this feature.

I'm not sure how to increase the count (I'm new to datapacks and decorators) as it won't let me repeat the element more than once and adding more kinds of count decorators (count to 256, count extra 256, count multilayer, range, etc) doesn't seem to do anything. An example feature generator file, to explain what I mean:

{
  "type": "minecraft:decorated",
  "config": {
    "decorator": {
      "type": "minecraft:heightmap",
      "config": {
        "heightmap": "MOTION_BLOCKING"
      }
    },
    "feature": {
      "type": "minecraft:netherrack_replace_blobs",
      "config": {
        "state": {
          "Name": "minecraft:air"
        },
        "target": {
          "Name": "minecraft:magenta_glazed_terracotta",
          "Properties": {
            "facing": "east"
          }
        },
        "radius": 12
      }
    }
  }
}

In this case the datapack is drawing magenta pyramids to shape palm tree leaves over and then trying to remove those blocks later. It previously did so with a radius of 96. So now I get these funkytown trees on all but a few that fall in the 12 radius:

I've been trying to figure out a way to increase the count and have also tried using the ore replacement method but that one doesn't seem to accept magenta terracotta. Are there other kinds of work-arounds? It might be good to provide such suggestions in the conversion feedback report. Regardless thank you so much for your help in making this.

[Geph]

Using the ore replacer and diamond blocks with extra count still only gets me part of the way there. I assume there's some better way of using a decorator to sweep over an area more comprehensively.

"feature": {
          "type": "minecraft:ore",
          "config": {
            "size": 64,
            "discard_chance_on_air_exposure": 0,
            "targets": [
              {
                "target": {
                  "predicate_type": "minecraft:tag_match",
                  "tag": "minecraft:diamond_ores"
                },
                "state": {
                  "Name": "minecraft:air"
                }
              }