That would be a solid plan. EDT is high volume, PTP is low volume. They compliment each other, especially back to back.
I've seen the book in the library. Worst case scenario, if you really don't want to buy it, hop into a Borders or Barnes and Noble and give it a read.
It's not an ab exercise. It's the side press.
You could. It wouldn't be textbook PTP, but the concept is definitely the same. Front squat/military press would be a little more acceptable since the bench press is kinda limited in muscle recruitment.
That's the PTP skeleton, yep. 2x5 (using the same weight each set) of two exercises five days a week, not hitting failure on any rep of any workout. I don't have the book in front of me, but you'd progress depending on how you're cycling the weights. Could be every week, could be every third week.
That defeats the purpose. PTP is based on drilling one movement with one particular weight into the ground. By changing the set/rep scheme so often, you'll be using constantly different weights (unless you still keep the weight the same, which is a whole 'nother can of confusion), and you'll be diluting the point of the original program.
Which two lifts, front squat and bench? The frequent practice will definitely help your skill, and the progam itself is okay for strength, but it's pretty low volume, and on the low side for intensity. I wouldn't stick with it for more than a month. And actually, it seems to benefit more beginning trainees as opposed to advanced lifters.
It's going to be hard to see the full effects just doing two-week cycles. A four-week cycle would be better, but as I said, not many people seem to do well past a month. And I'm not crazy about doing just deadlifts and abs, unless it's a big move like Turkish get-ups or full contact twists.