There was a video about Layer scaling rotation some dude posted WAY BACK showing FULL layer rotation but if you are saying its not supported Ashley then he must have used a similar technique to what you described...I dont know where that Video is now..but I think it was previously in the Tutorials Section...
The guy was showing off full rotation, scaling and whatnot..showcasing some of the features of C2
Yeah also, try looking at the Airscape game on the Arcade and Forum posts about how it was done...I am pretty sure they posted tutorials on how they did it..
it uses rotation of the entire layout or something ..
The game is here..http://www.scirra.com/arcade/addicting-rotary-games/848/airscape
You can find the Forum threads with some digging
When in doubt..or you are lost in a Zombie apocalypse or someone is giving you a hard time..Remember one thing..... Read the Construct 2 Manual..it will save your life.:)