you can do concentrates directly by using a Crafty/Mighty liquid pad in the LSV WPA
http://www.storz-bickel.com/shop_us/en/crafty-liquid-pad-set.html
http://7thfloorvapes.com/index.php/seventhfloorvapes/lsv-water-pipe-adapter.html
I'd take a desktop, maybe a Silver Surfer or a log, along with a small, cheap bubbler; a session portable, like the Air/Solo; and a one-hitter, like a Firefly, MFLB or Vapor Genie
your suggestion contradicts science. Inhaled cannabis is processed through the lungs and enters the bloodstream to the brain virtually immediately. "holding it in your lungs" is unnecessary