Thanks for the suggestion, @daveplus . I did have a look at that - and download the file - but have gone with the Ashampoo product mentioned earlier. It seems to do all I want, but I'm still learning and my decaying brain is struggling 😉 I'm sure I'll crack it, though.
I have marked @Baldrick1 's response in post #8 as the fix as I have installed and quickly played with the suggested program - it seems to do what I want, but I need a little more free time to fine-tune and learn exactly how to use it.
Many thanks for all the other suggestions - I have downloaded the installers for most of them in case I find any gotchas after more detailed use.