Is it permissible to work in restoring church stained glass if there are no other job opportunities?

Working in a glass workshop is permissible. However, if it becomes known that any part of the work is intended for places of disbelief (kufr) or sin (ma'siyah), then it is obligatory to refrain from doing that work, so as not to cooperate in sin and transgression. Allah Almighty says: "And do not cooperate in sin and aggression." (Al-Ma'idah: 2)