If the entree fee is $150 per team, let the scrubs enter. You can lock entrees a week or two before evo, make the bracket, and only allow last minute entrees that fill in the byes. Early matches can be played through 3 or so setups to make it fast, then have the top 4 or so played with commentary. This isn't replacing singles which won't have such a steep entree fee where everyone can enter.
I'd suggest having one qualifier for each region, north/south/east/west, preferably just do them at the evo tournaments in each area if its the same as this year. Whoever wins each one gets seeded as that regions leading team and everyone else gets random. Another option is the 4 region leaders and 4 other teams who have to qualify at Vegas to get into the last 8, with losses reset, so its basically the first tournament(4 teams who qualified can't enter), and the top 4 all get to enter the second tournament with the 4 qualifiers.