It's obviously late in the game to be making suggestions, but I wonder how something close to the normal Jackpot structure would run, with WSOP packages up top.
With a $15 buyin awarding 3 WSOP packages for the top jackpot, you could have a structure like below (where the 2500 buyin top tier would be 3 $12,500 packages).
A benefit if this structure is that they would be attractive to more grinders than the current WSOJs. The package frequency is lower than in the current structure, but it seems the games would run more.
To avoid cannibalizing the current stakes, maybe remove the $2s and $10s (and the devil-spawn $3 WSOJs) and replace them with regular $5s and these $15 WSOJs (and keep the regular $40s).