Three parts (boss, colleague and you) are looking for a win-win situation.
#Your boss needs those publication for next grand application but she is not sure you colleagues can work for her. That's why she needs you as an substitute (backup).
#Your colleagues wants to find a better life. They need publication and boss's support. But they are not sure when and where they can find their job. They put their legs at both ends.
#You wish your colleague find a dream job, so they will leave and you can stay. No one could been hurt by this way.
You are at a less priority situation, the only one advantage you have is less paid but with a less production (sorry to say that, but based on your description).
The best way to you is to have you one leg out to find a place to step on, so you can have some options. Otherwise, you go the volunteer way.
Good luck
#Your boss needs those publication for next grand application but she is not sure you colleagues can work for her. That's why she needs you as an substitute (backup).
#Your colleagues wants to find a better life. They need publication and boss's support. But they are not sure when and where they can find their job. They put their legs at both ends.
#You wish your colleague find a dream job, so they will leave and you can stay. No one could been hurt by this way.
You are at a less priority situation, the only one advantage you have is less paid but with a less production (sorry to say that, but based on your description).
The best way to you is to have you one leg out to find a place to step on, so you can have some options. Otherwise, you go the volunteer way.
Good luck