Starting a sequence track from within another sequence track?

Is it possible to trigger a sequence track from within another sequencer track?

For example I have a sequence film shot where I would like to trigger a door open animation when the camera gets close. The door open animation is in a sequence track which works fine by itself but not when I try to call it from another sequence track.
It’d like to keep the open door animation in it’s own sequence track since I plan on multiple different cinematic shoots and don’t want to have to manually place the open door keyframes in each one… but if there is no other way?