1. Open your Unity/Unity project containing the working VRChat SDK.
2. Open the Example-Avatar scene.
3. Navigate to "C:\Users\YOUR USERNAME HERE\AppData\Local\Temp\DefaultCompany\YOUR UNITY PROJECT NAME HERE".
4. Delete everything that's in the folder just for good measure.
5. Click the Vrchat_Tutorial_Avatar prefab in the scenes hierarchy & remove it's pipeline manager script.
6. Click the VRChat SDK menu button, then click "Show build control panel".
7. Click the Build & Publish button.
8. Fill out the required information but DO NOT CLICK UPLOAD YET!
9. Return to where you saved the uncompressed vrca file & open it in Notepad ++
10. Once opened in Notepad ++ hit Ctrl+F and type "avtr" it should direct you to where the full Blueprint ID is located within the file.
11. Once you've found the entire Blueprint ID within the file highlight it all including "avtr_". ~ select it slowly if it does the annoying select issue.
12. Keep it selected & return to Unity you should see a Blueprint ID generated for you on the example avatar copy the whole ID starting from "avtr".
13. Return to Notepad ++ and paste/replace the highlighted Blueprint ID with yours, then hit file > save.
14. Go back to Asset Bundle Extractor & hit File > Compress & select your uncompressed "custom.vrca" in the open file dialog.
15. Defaults are fine, just click OK. Find & click your uncompressed "custom.vrca" file in the save file dialog and hit save to replace it with the compressed version.
16. Navigate back to "C:\Users\YOUR USERNAME HERE\AppData\Local\Temp\DefaultCompany\YOUR UNITY PROJECT NAME HERE".
17. Replace the "custom.vrca" found in there with your "custom.vrca" then return to Unity & click upload!

[Final Statements/Extra Notes]
I'm not exactly sure if EireeClientPublic & Avatar Logger have to go together but I was too lazy to find out. Better safe than sorry eh? :x
I personally use VRCTools I don't know if it helps Avatar Logger log better than VRLoader does, but it seems like it to me.
This whole process is pretty straight forward tbh and quick once you get the hang of it.
Asset Bundle Extractor seems to not like it when you try to override the custom.vrca with your re-compressed version, so just save it elsewhere.