The only problem is almost all of them have different ways of triggering the boss spawning or cutscenes. For example- Dethrone the white tyrant you have to skip level, run to kobold cutscene, wait for that, run to boss cutscene. For challenge you just need a skiplevel and run forward a couple seconds (sometimes backwards again too)... For blood lord, one skip level and 2 seconds moving forward.. They all are different in those ways..
Though they all can be triggered with the skip level key bind thing