I used to fly West Coast of Australia (Perth) to LA every 4 weeks (and return in between).

I’ve always just set my watch (and all my devices) to the destination time as soon as I get on the plane and behaved as if I’m in that time zone from that point on. If I arrive in the afternoon I just treat it as the afternoon on arrival and honestly apart from maybe 1 or 2 nights of disruptive sleep it’s a non issue.

I used to travel Oz to UK with work when younger and have travelled to US a lot so long flights (20+ hours of flight time) are no big deal but I reckon a decent chunk of jet lag is mental. Just trick your brain and get on with it.

Edit: I also rarely drink anything except water on flights. A long flight dehydrates the crap out of you, alcohol makes it worse, which hurts your in flight rest and how you feel on arrival.

Any idea how they will deal with the fairly common arrangement of sub contractors?

So say I use my own company to sub contract to large corporate.

They pay my company and my company pays me.