I was just watching my Glenn Harris youth spread DVD's yesterday and he talks about running what he refers to as a "youth zone" when he runs his trap series from the spread. He basically has all of the linemen aside from the pulling tackle zone AWAY from the play. The line, regardless of covered/uncovered, would take a slide step to the backside to cover their gap; if nobody is there to block then work up to the linebackers. When I taught it this year, I told the kids to step away (slide to the backside) and then run a track up to the linebackers. (I emphasized their track @ 45 degrees and used PVC pipe to guide them)
Yes, this is very similar to SAB/TKO, but with differences.
He talks about emphasizing to the kids that they only have to protect their little piece of ground and then work up if that piece of ground is empty. I taught the kids to "step away and run their track". Apparently he tried for three years to make a true zone scheme to work at youth level, including middle school, and couldn't make it work; that's why he does it like I described above.
What I liked about it, in my scenario, was that the kids only had to learn track right and track left for our running plays. We ran his whole trap series using this, which was FB trap/Trap Follow (ISO with FB) & Trap keep. We also ran our jet sweep series with this zone scheme too.
If we really wanted to run the trap as a "power" play, we'd call trap follow, which gives us a tackle pulling and kicking along with a FB leading through the hole for the QB.