Hey Henry, thanks for sharing and your ambitious donation goal!
I haven’t looked into locum work yet, as I won’t be working as a doctor in the long term but figured it would make sense to write down my experience here anyway for others.
My intuition is that I would need a lot more experience for locum work and that especially anesthesiology is very well-suited for it, because you can adapt to new patients and environments more quickly. In the (urban) clinics where I work, I never met someone on locum work. We do have one experienced resident who is employed as 0,5 FTE and does 7 night shifts in psychiatry every month.
What I have heard of is radiologists with a US-license who are paid to live in Australia and work US night shifts remotely. I found that quite intriguing.