Nice bike and project efleschner!
In terms of reviving your bike again, it seems you have got most critical things already on your list.
I would maybe just add:

In terms of reviving your bike again, it seems you have got most critical things already on your list.
I would maybe just add:
- Check, Clean /replace the air filter
- Bleed the front brakes and possibly replace the brake fluid entirely if possible / needed.
- Double check rear brakes, adjust and or if your hands are real itchy, maybe open the drum and clean and regrease pins.