Doing your best with what you've got
Doing your best with what you've got, or its subproblem doing your best with what you've been given is something that all teachers recognise. Perhaps it could be formally called "suboptimal material optimisation".
Teachers are sometimes given materials which are inadequate, because they are clearly not based on any recognised pedagogic principles, do not fit the students' learning styles, do not fit the teacher's teaching style, are too difficult or too easy for the students, or are otherwise inappropriate. If you're lucky enough to have material at all.
Teachers might have little preparation time in which to rewrite material. In this context, doing your best with what you've got is probably the best approach.
Managers might have little sympathy for this.