Would purchasing donation coupons for the Muslims of Burma and Syria, and the "Tarahum" project for 70 Riyals, be considered a sufficient expiation for the remaining three days of make-up fasting due to pregnancy and illness?

If you delayed making up the fasts due to pregnancy and illness, then no expiatory payment (fidyah (definition)) is required of you. However, if an expiatory payment is required of you, then paying the equivalent value of one and a half saa‘ (about 3 kg) of food for the three days is sufficient and fulfills the obligation. If those to whom you give the money buy food with it for the poor, then it is sufficient and absolves you of responsibility.