"Switch to a field that involves many people dying if you write a bug" doesn't sound like the less stressful alternative to me.

Especially for developers of server, desktop, or web software. Experience in those fields will be more a hindrance than an advantage if you want to enter embedded development. Embedded is a whole different beast and you’d have to unlearn a lot of bad habits and expectations that your former field instilled in you. No hiring manager will give you the time for that.

So maybe try the weapons industry? If you write a bug, it will probably miss the target, and people won't die.