The phrase "alone for us" is grammatically correct and can be used in written English.
It can be used to express a sense of solitude or isolation that is specifically relevant to a group or individuals.
Example: "In this vast world, sometimes we feel alone for us, even when surrounded by others."
Alternatives: "isolated for us" or "solitary for us".
When you leave the room the sheer pleasure of being hit by a wall of hot, dry air is worth the trip alone for us chilly northern Europeans.
"He not only played a tough position, but just his presence alone for us was more than enough.
I'd rather things – especially things featuring costumed talking cats – were left alone, for us to revisit at will.
It's hard to find a place for a German to live in Berlin, let alone for us.
Some of them didn't even want to do business with us let alone work for us.
But I remember feeling guilty about leaving my two children out -- so we ended up including them in most of our weekend activities -- leaving little alone time for us.
The other worrying implication of Ms. Lauten's comment about the President disrespecting the nation combined with the wider usage of "Americans said" by the new majority in Congress is the assumption that they alone speak for us.
When you stop to consider all of the information that is just a click or two away with any cell phone with a browser, is it really reasonable, let alone responsible, for us to put young kids so close to so much inappropriate material and then expect them to escape harm?
And most of the time, you can't control blood pressure with a diuretic alone; diuretics for us, at least for me and for lots of people here, are mainly for second line.
Given the cacophony of such competing theories, the likelihood that any one of them is the "right" one for any one of us, let alone for all of us, is rather remote.
"Even if he has to stand alone, he fights for us".
