[racket] choice% - replace all choices

hello,

is there a way to replace all the choices at one whack?

i have choice lists several hundred items long, which to reset with
choice% methods clear, append will be tedious  

the only way i can see is to work on a parent area-container% with
change-children, but that also looks tedious.

it were best to subclass choice%, but there seems to be no way to access
the choices field.


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