Why not DoL/H jump potions?
If the jump potion is all about bring people into new content. There should be a Jump of DoL/H, There isn't because people that do DoL/H have spare time.
In turn jump potions isn't about getting new people to new content. It's about shorting the time to takes to do the content people mostly want to do. In turn increased EXP across the board would seem to be a better option.