The Michigan Lead-Based Paint licensed inspector is required to send multiple paint chips to a Michigan approved lab to be tested for lead. 

And if you talk with Dino, tell him Nolan from the Lab says hi :)

I plan to spend a week or two out there as soon as we close with my roofer brother and we'll get all the easy stuff done ourselves while supervising the bigger projects.

I'd share the risk with an experienced rehab partner -you secure the capital. they supervise the project. other than that id worry about holding costs.

Finding and supervising them from 1/2 way around the world seems like a stretch that will most likely cause you a pile of problems you neither want or need.Hiring a GC seems like the most practical thing to do.

He’s gonna be doing all the supervising and showing up to the sites along with getting all the contractors to do the work.

In some states it’s salesperson and broker and the only difference between those is as a broker you can have your own firm but as an agent you have to work under the supervision of a broker and hang your license with them. 

Learn how to supervise it. 

Should be a yellow lab on a rock.

The broker supervises the licensees, and as such the licensed agents have to abide by their broker's rules and determinations.