Slow down here. Let’s assume you’re the bishop or the religious superior. Take your pick.
If you want to impose something on the clergy, then you need to find the canons that allow you to do so. This is where you (as the bishop or religious superior) will run into obstacles).
Canonically, secular clerics do not make vows. They do not vow obedience. They make a promise to obey, but it has traditionally been applied to those things that the bishop can legally command.
Canon law says that religiuos may vows of obedience, but major superiors can only command what is allowed by the community.
If you’re a bishop, you would have to find a canon that allows you to command the extraordinary. You will not find it.
If you’re a religious superior, the extraordinary becomes ordinary if it’s built into your statutes. Even there, if it’s not in the statutes, it’s extraordinary. The constitution, the rule and the founder tell you what you can command and what you cannot command. You don’t have a free hand.
If you were a bishop and you commanded any priest to celebrate the EF, he can decline. If you push the issue he has legal recourse against you. The UE has safety measures built in for this. Observe what it says.
10. § 1. The Pontifical Commission exercises this power, beyond the faculties previously granted by Pope John Paul II and confirmed by Pope Benedict XVI (cf. Motu Proprio Summorum Pontificum, artt. 11-12), also by means of the power to decide upon recourses legitimately sent to it, as hierarchical Superior, against any possible singular administrative provision of an Ordinary which appears to be contrary to the Motu Proprio.
§ 2. The decrees by which the Pontifical Commission decides recourses may be challenged ad normam iuris before the Supreme Tribunal of the Apostolic Signatura.
The Ordinary cannot act contrary to the Motu Proprio. He may not prohibit the EF. That’s clearly stated in the Motu Proprio. He cannot command it, because that’s not authorized by the Motu Proprio.
If he oversteps the Motu Proprio, the priest has legal recourse and can take it as far as a tribunal.
Bishops and religious superiors cannot govern without boundaries. The boundaries are different for each. In fact, the bishop has more restrictions on him than does a religious superior, because Canon Law says very little about the rights of religious superiors. It leaves that up to the rule. However, it does say quite a bit about the rights of a bishop. If it’s not in the law, the bishop may not do it, unless he has permission from the Holy See.
If you’re the bishop in this situation, what you want to command is neither in Canon Law nor in Summorum Pontificum. Therefore, you cannot command it. In order to command, you must receive the authority to do so.
Fraternally,
Br. JR, OSF