Time for me to experiment with that script, thanks, Tom.
And high time I thanked you for it.
As I said before - what a terrific forum this is.
Discourse has told me that - as a new poster - I've now reached the maximum number of posts I'm allowed for one day:-(
So I have to add this here:
Sleepy - Yes, I always work from backups; thanks… would it surprise you to know that in addition to TM I actually rotate SuperDuper clones across no fewer than 11 (that's right eleven) external backup drives?
Tom - point taken about understanding where KM fits in to all other (such) utilities. I have played with awk, sed and a lot with Perl. I'd actually have no difficulty massaging those strings with those - after a bit of de-rusting 
I'm committed to familiarising myself with KM and thereby making sure I use it only in the most appropriate ways.
I've also experimented with Automator and have Alfred installed.