It seems to be working ok, the event pops and I start seeing lots of planets.
Using about 7GB of ram for ludicris and 14 civs at the start.
After starting a campaign, I realize that using this with Intrigue implies a need for an update to the number of planets per government type. There's a GovernmentDefs file under the DLC for Intrigue and you can mod the colonyLimits parameter to increase the number of non-penalized planets allowed under each government type.
I'm trying it with 3x the normal limits as a guess for reasonable numbers.