Yeah your question I thought was interesting. I'm not sure.

where your trouble is -- it's precisely the stuff out of control that the modern, objective person wouldn't waste time worrying about. Be it luck or religious or phantom mechanism, the expression supposes that by some unknown, unseen mechanism, the fates of people we "wish well" will be decided. Referencing that will always be interpretable as a form of mysticism. just a hunch.

That's why I tried to focus on something concrete.

You could say, "good health".

"May you get what you want". [or need]