Here's a run down for the single injector TBI units. Should be fairly close to what you're doing only with two injectors now.
http://www.allpar.com/fix/fuel/throttle-body-rebuild/
DEF isn't quite that expensive. Q7 holds around 6 gallons of DEF. Refilled every 10-15k miles depending on drive habit. At the good 'ole AZ it's $15 for 2.5 gallons. So most people shouldn't be spending anywhere near $150 on DEF every 10-15k.
Pull them out and take them to The Right Stuff in westerville. They can custom bend any line that you take them. You'll have the choice of mild steel or stainless as well.
The Right Stuff Detailing
200 Intek Way, Westerville, OH 43082
(800) 405-2000