Thanks, Charles. I got it to do what I want using /selection. Here's an interesting comparison. My first attempt used familiar externals and plugins. It took 3-4 minutes to compose (without needing any help).
When used on a local copy of the file, TPIPE gets the job done in one third the time. I'm not sure it was worth it. If I had used TPIPE as long as I have used EGREP, TR, and SED, I'd still have to go to the docs.
The bottom line is it's going to be cold tonight!
I know the user can save TPIPE filters, but I have never done it. It would be nice if the more familiar text utills (or specific uses of them) could have short TPIPE versions, with replaceable parameters, and which could be strung together. For example, if I had (somehow) defined "/squeeze" to act like TR.EXE -s, and /cut to act like CUT.EXE, then instead of