Well, it turns out to be dirt-simple to replicate this functionality
using ksh and netcat.  To do the equivalent of -L10000:localhost:10000,
for example, all it takes is:

        $ nc -l -p 10000 |&
        $ ssh myhost /usr/bin/nc localhost 10000 <&p >&p

This should be adequate for my purposes.  My thanks to everyone who
replied both on and off list.



 
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