What a fine puzzle! Some quite tricky clues, but no complaints there. And a delightful endgame. I do have a couple of minor quibbles with the preamble, but I'll leave those for now. I got stuck on enacting step one for quite a while, but once I spotted what was going on it's actually entirely determined. Very nice. Many thanks Check.
There are a couple of clues that are just slightly bothering me. In 17, I have the definition (snigger), but I'm not sure about the wordplay. Conversely, in 22, I have the wordplay, but it seems to produce a word I can't quite match up with the definition: to incite is not the same as to play a prank on, is it?