Of all the bosses, I was thinking Ghom would be the best - good elite pack density in Keeps, WP right outside Ghom's door and he's one of the easiest bosses.
Here's what I was thinking:
- Start quest Act III, The Breached Keep, Kill Ghom.
- WP to Keep 1. Check for elite pack in room to the right for 1 NV.
- Go to Keep 2 and get 4 NV (3 if you got one at Keep 1).
- TP to Town.
- WP to Keep 3 and get last NV, usually not far from WP down long corridor going away from Larder entrance.
- Enter Larder. Kill Ghom.
I haven't tested this or any other bosses that will drop the new plans to be honest AND I don't know if this route will work for all classes/builds. I'll probably aim for an MP that takes me about 5-8 mins max. Probably won't take long to get all 16 new plans.
Let me know what you think. I'll probably be trying out different routes tonight before maintenance.