Sorry to be so late, new to this so it’s taking me some time. Got all but the first word of 27ac. Penny not dropping though I know you appreciated the clever wordplay. Thanks for the rest of your help.
Thanks, Brendan. [Spoiler alert] The funny thing is that I never noticed the puzzle's theme (until reading on in the thread), but my 12a post, way back on p. 1, explicitly stated it! Go figure... :)