The reason I mentioned ATC is that they eliminated 'position' when it comes to runway operations for good reason. A position is something specific geographic as in 'how the aircraft is located relative to a navigational feature' (and a 'hold' is something you do in the air, not on the runway)
So the aircraft parked on the end of a runway is not a specific geographic position in relation to a navaid? You seem to miss important details : 1 uncontrolled 2 - never said position and hold only position.
So you just plant yourself on the end of the runway to run through your checklists while others are trying to land ? Not terribly polite imnho, also you deprive yourself of the view of final when you 'position' yourself. When you are ready-ready, you enter the runway and take off, all the checks you mentioned except for confirming runway alignment should be finished before you make your call and nudge the throttle forward.
Don't put words in my mouth. I do not run through my checklist while parked on the runway. I do one last look over everything before heading out. TRIPLE checked like I already said, 15 secs tops.
If I say 'departing to the east', the guy approaching from the east knows instantly that I am heading heading his way. If you talk about 'something 45' he needs to start doing geometry in his head. Why?
Because as I've already said one time already... the AIM only recomends departing a runway in two fashions - straight out and 45. Defining which recommendation you are using is prudent.