something like displace_box (triclinic) but without periodicity requirement?

Dear developers,

I would like to ask if it is possible to change triclinic box parameters (tilt) via something else than
displace_box ?

What I would like to do is basically apply
displace box xy
for the case where there is no periodicity in y.
I just need to skew triclinic box in xy and
remap atoms position according to that skew.

I can change atom positions easily with
displace atoms ... ramp

is there a command to change tilt factors of triclinic box without periodicity requirement?

Thank you in advance,

Kind regards,
Denis Davydov

It doesn't make sense conceptually
to have a tricilinic box that isn't periodic,
since the point of triclinic is that there is
an offset in x when you cross the y periodic

But you can use an orthogonal box with
free surfaces in y, and skew the atoms
in x however you wish, or have free
surfaces in x as well.