hardly and hardly even are other options.
"harldly" is perhaps even more natural for young people today than "let alone" or 'much less" or "never mind"
I am somewhat reluctant as I would naturally choose one of the other answers over "hardly"
Hardly can be used frequently in a "neither nor" sort of way with 'let alone'
Parent: "Do you want to go to school today son?"
Child: "Dad I can hardly get out of bed, let alone go to school."
(instead of the Child: "Dad I don't want to get out of bed, (the word) go to school.")
Child: "Dad I don't want to get out of bed, hardly go to school."
(Might also work and fit your request more directly - however it would be a step more proactive in questioning judgement - 'let alone' and the others point out an missed consideration - something that also might want to be avoided -'hardly' points it out even more flippantly if referring to forgone action.)
But even more frequently I might hear a younger voice (I'm 53 so younger is under 30 maybe) use hardly without 'let alone'
Child: "Dad I can hardly get out of bed, I don't want go to school."
(which moved the verb to the first clause with hardly)
or more likely they might use "can't" . Can't would be more commonin that I think kids are less inclined to using hypotheticals and "want to" is not only about will but leaves an open uncertainty which they are not considering. It is not a 'take-away' they need to present.
Child: "Dad I can't go to school. I can hardly get out of bed."
I think the last is the most modern and common conversational approach and the others might seem a bit formal and stilted to people under 30.
EVEN MORE LIKELY
Child: I can hardly get out of bed
In the twitter and text generation, restating a point at hand that both in the conversation know is the point is seen as a bit even pedantic...
... which I must say can be irritating to me yet.. I suppose they are extra words and I know that the "hardly" refers to the unsaid alternative.