I think I've found a way of satisfying the preamble... although it isn't very satisfying, so I'll finish off my part of the discussion and move on.
The preamble suggests there's an ingenious endgame here but, unfortunately, I haven't found it - and it will have to be pretty spectacular to leave real words throughout the grid!
My concern here is that certain words in the preamble are of the 'stretchy' kind ('Leaving [real words]', 'keeping in mind', cryptically represented' etc) and without doing much more than filling the grid and dealing with the conjoined 'interrupters' in the most obvious way, most of the instructions have been met (and, perhaps, all of them).
I was hoping to do something in the silver section (with its full complement of '40 letters', as per the preamble) that would make the cryptic representation linear, but still have the correct synonyms - or new ones - as real words around it, and (best of all) make real words from the jumbled across entries.
I'll look in here from time to time in the hope someone manages it - because it's a very long time to wait for the published solution! Still, it will be well worth the wait (unless this is a GWIT type of puzzle - one that hinges on how we've interpreted the preamble... which has been my route, to be honest).