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If no one other that the OP supports this, I would like to
reject putting this in the struct module.  Initially, it
seemed like a fit because the endian options and whatnot are
already in place; however, in one way or another each of the
posters except the OP has stated good reasons for it not
being in the struct module.

Variable length C structure members are not what the module
is about. Having to know the length in advance of the call
is a killer.  The learning curve issues with struct are also
a problem.  And, the use cases jsut don't point to struct.

Put in a simple function in binascii or let's drop it.