How to use sftp instead of ftp in ange-ftp

[ken]

For a long time I've been using ange-ftp.  But more and more servers are 
using the more secure ssh package; this means clients have to use sftp 
rather than ftp for transferring files.  This means ange-ftp no longer 
works.

I tried (some time ago) going into Customize and simply changing the
variables

(custom-set-variables
 '(ftp-prompt-regexp "^sftp>")
 '(ftp-program "sftp"))

but the sftp command set is quite different, so I really shouldn't have 
expected the session to function correctly... and it didn't.

I'm sure that someone else has already done the conversion of ange-ftp 
to use sftp.  How/Where can I get it?

I'm using 20.7.1.


tia,
ken

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