Hi Noel,
Thanks to you and Rustyspoon for your responses.
I would be intending to take your option a) (full install of FLAC RT/TDs on my internal computer drive). I have a large, fast SSD installed especially for this.
And you are correct, I do have lots of stuff that probably isn't available from PG any more - I have pretty much bought every plus-pak and style set that I could over the years. What is more I am not sure exactly
what I have got so reinstalling (even if I can locate the files) could be a challenge!

Rustyspoon is correct, the style sets don't
normally include new track content but I believe that a few of them
have had some additional RT/RD content.
Regards, Aubrey