If Valve buys this map for Halloween maybe you can get them to find a way around the stickies-on-the-tower problem. Maybe by adding a brush entity that's always invisible and has no properties besides being killable, so stickies can cling to them but then let go when it goes bye-bye.
I'd imagine if it was that easy they would've did it for their own map finales already. Thundermountain being a notable example.
It's not too bad, we did a lot of work to give stickies a decent place to grip onto on the tower without compromising the look when players explode with it.