Earlier quoted context omitted.
Seems to me like the actual problem is staring you right in the face, though: you are not in a tech cluster and you don't want to countenance remote working. That instantaneously removes 90% of the pool - or rather 99%, since no city on Earth has 75m people in commuting distance. No wonder you struggle to find people, particularly for a hard skill like assembler.
I did remote work for a while, but honestly, I prefer going into an office. Even with a home office, my family or dogs and up demanding a lot of my attention through the day, and it's difficult/frustrating since it takes me out of my mental zone/thought process. That was a while ago.. now, as a manager, I could try some remote employees, but I honestly prefer having face time with my employees... Most remote workers…
That's a failure of upper management to demand accountability from him. A lot of people hide a lot of stuff even when they are at the office.
> What interview questions can you ask to very "dedicated remote workers" from "easy paycheck remote workers"?
The same you ask to discern between "dedicated office worker" and "minesweeper-champion office worker"?
> How to you improve performance in remote workers
Promote accountability based on deliverables and targets. Establish always-on communication channels and systems, keeping remotes involved in the decision-making rather than being recipients of orders. Have periodic reviews, particularly if things are slower than expected. And at the end of the day, don't be scared to let people go if they are not meeting expectations, or to put your foot down on things like webcam usage if you really need it.