Do you know any EMTs? I do, and it sounds like you might also. In the US at least, this seems the opposite direction of what OP is asking. Long hours, low pay when amortized over hours on call, high stress, **but *** potentially great personal satisfaction. Also potential career track to other first responder/medical roles, which can be another plus, e.g. wilderness SAR, marine emergency SAR, trauma nurse, etc.

If I have any of that wrong, I sincerely would enjoy additional context and discourse.

*A close friend from high school went the EMT->trauma nurse route. He has the temperament for it and absolutely rocks it. He is doing waaaaay better financially and spiritually than most of our social circle. His hours aren’t consistent per se, 3 days on, 3 days off plus any additional shifts he wants. He could have retired about 5 years ago, but loves the work too much.