As far as Ontario is concerned, some statutes seem to have been amended to allow exception to swearing allegiance to the "crown" and substitute wording related to the discharge of duties with respect to the laws of the nation and province and/or duties of office, with no reference to the monarchy, and only optional refence to God.
I skimmed what look like the relevant regulations/acts. There seems to be some latitude (perhaps recent, c.2017???) allowing the Lieutenant Governor to make regulations respecting who is required to swear/affirm and which type of oath.
Personally, I don't mind the Queen and her brood, they may still have some very small utility in the Canadian context, but I'm not swearing allegiance to them and their "heirs and successors..." WTF?
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