I was using both, RecycleManager and RecycleBlueprints Plugin but was always annoyed that there is a conflict between both and the recycler would spit out a "fake items (old blueprint)" that disappears quickly.

You can just add all blueprints to the recycle manager plugin.

Open this file:
oxide\data\RecycleManager.json

Just add a chunk for "blueprintbase". It represents all kind of blueprints and decide what the recycle output should be.
In my example it is just 10 Scrap.
Add this

"blueprintbase": [
      {
        "itemAmount": 10,
        "itemName": "scrap"
      }
    ],​

in the "table"-Content.

Should look like that :

{
  "table": {
   "blueprintbase": [
      {
        "itemAmount": 10,
        "itemName": "scrap"
      }
    ],
    "ammo.grenadelauncher.buckshot": [
      {
        "itemName": "metal.fragments",
        "itemAmount": 2
      },
      {
        "itemName": "gunpowder",
        "itemAmount": 7
      }
    ],
///........