Summoning the Queen a second time

Who thought having to collect Seeker Solider trophies with their 5% drop was a good idea? Every other boss has been reasonable to collect materials for but this is just absurd. I managed to go through an entire *large* island of Mistlands, do several dungeons, fight tons of Seeker Soldiers without a single trophy drop. It's maddening. I only have 2 total through my entire solo play through, and I'd like to summon her without using the one I've put up in my trophy room, which means I need 2 more. If y'all have any tips please share because I'm running out of patience just wandering the mists for hours.