I advise making strong "ties with thais" in the industry and working with them. There is a need for foreign expertise in this area. I would.not advise trying to go it alone, even if you somehow manage to succeed without local connections, you will likely be contravening thai law in various ways.
Spend time making friendships with farm.owners, many of whom also have shopfronts. Get to know the employment and visa law well and of course keep an eye on the silly political situation around this as you say you are.
It's an agent scam. I am also an Aussie who lives in both countries. Take your Aussie bike license with you and it is very easy to use that to obtain a Thai license with just a simple colour blindness and reflex test in a couple of hours. No agent necessary and very cheap. After first license of a year you then get a 5 license which I have. Car license is separate and just as easy
PR is what you can obtain after 3 years working not citizenship.... that's a whole different and much more difficult and lengthy process that you probably wouldn't want to do anyway.
Onve you have reported the lost passport to police and applied for the emergency passport from.the embassy, your old passport is automatically canceled so there's no benefit to finding it.