The Kaiju Patron is now on DM's Guild as a PWYW title. A sleeping (or awake?) or imprisoned kaiju is a pretty good fit as a warlock patron, offering a number of plot hooks. Kaiju warlocks are hard to kill and, at higher levels, have a couple of unique AOE abilities. They're a good fit for a non-Hexblade Bladelock, as well as working just fine for the other pact boons.