It wasn't long ago when that was the only way to do it. So it's clearly doable.
If I was dead last however, I would for sure go for 20k/week until the allstar break. Do a scouting combine to weed out the 19y olds. And go down to 5k or 10k as soon as i found a real good 18 old. Which could be right away. As long as the list is out during this week it wouldn't effect that scenario. But I don't see any benifit from denying the option of tinkering with the list as soon as possible.