[plt-scheme] re-open a bytes/string port?

Hi all -

is there a way to *re-open* a bytes/string port?  With a file port, I can
look at the object-name to obtain its path, and use that to open another
port reading from the file, but it appears there isn't an equivalent
mechanism for bytes/string unless I happen to have a handle of the original
source.

Any tip is appreciated, thanks.
yc
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