Minyan on Shabbat

Hello Rabbi, we have a youth group in the school on Shabbat and the behavior of the participants is very, very demeaning to the sanctity of the place, especially the talking (and loud) during the prayer and Torah reading, and the record speed of the Shatz and the Baal reading. So far, they have not been able to solve the problem. But now a new rabbi has arrived and he looks like a scholar, and when he saw the situation, he was very shocked and as a result he turned to the management and said that he would not continue like this, but that they would let him shorten the prayer (to pray standing together without repeating, to shorten the “Mi She Berechim” and even to shorten the Torah reading to a third) and make it slower and that he would also deliver a short and to the point Torah talk before the reading and of course there would be no talking during the prayer. It seems that his intention is that if he tells everyone to be quiet, it will not work. Therefore, he wants to shorten it to a shorter time so that people can stand it and at the same time pray with intention and that there will be a meaningful prayer. But I wanted to know what the rabbi’s opinion is on the matter. Is this permissible? Thank you.