More like you are good at convincing people to do things that aren't smart yourself.
Here is a guide from this site that specifically says that your "best answer" is fail.http://www.tomshardware.com/reviews/cooling-airflow-heatsink,3053-4.html
Also, since when is the bottom mount PSU not the best idea? What are you comparing this to exactly? The top mount PSU is clearly worse than an adequate bottom mount setup.
I am not a big fan of mounting the PSU with the intake fan down and only a little bit of clearance - edit - and no holes in the bottom - end edit -, but it is in no way clear that your method is the lesser of two evils, especially when we don't even know how much clearance there even is.