cloneRule (old rule, new rule) for lib/GenTest/Grammar.pm which just duplicates a given grammar rule

This function seems to be necessary for a sophisticated RQG grammar simplifier.
Extreme simple and artificial scenario for illustration of the problem:
We search for desired_status_codes => [ STATUS_OK ] , expected_output => [ 'server has gone away' ]
query:
   tricky tricky;
tricky:
   KILL | CONNECTION_ID() ;
The usual attempt of the simplifier to shrink "tricky" will fail.
But in case I would have the cloneRule-function I could write a smart simplifier
which changes the grammar to
query:
   tricky1 tricky2;
tricky1:
   KILL | CONNECTION_ID() ;
tricky2:
   KILL | CONNECTION_ID() ;
Realistic scenario:
     Have a fat grammar where some rule
     table_name:
         t1 | t2 | t3 | ....
     is used within the components of various other grammar rules.
cloneRule
     Input name of rule to clone
     Input name of cloned rule
or maybe
    Input name of rule to clone
    Output name of cloned rule , the name must be unique