To my mind, any potential abuses would need to be fairly substantive changes - and any substantive changes would alter the plain meaning of the laws in question. Anything more severe than adding in a missing full-stop, changing up numbering to match other legislation, or capitalizing an uncapitalized word, would very likely be immediately contested.
Moreover, purely technically, someone could simply state 'I preemptively oppose this change until I've had a chance to review it and subsequently withdraw my opposition' upon any such change being announced, which would be within the letter, if not the spirit, of this law - which is why I continue to make our current option of passing legislation available.
My worry is that a Speaker could take advantage of a lull in activity where the other Skrifa and Monarch just happen to not be there within the 48 hours.
It is an edge case, but I'd certainly like to see some way of dealing with this other than then having to go back and pass another amendment to the law to bring it back to how it used to be. Largely because an amendment to revert a non-amendment seems rather silly. Perhaps allow either/both the Underhusen and Overhusen to contest changes after they are implemented by a simple majority vote, at which point the law is reverted back to how it was previously and then such a change must be introduced via an amendment?
Really I just proposed this legislation because I think it's kind of dumb that the only work we can consistently do is correct grammatical errors, but we nonetheless receive some level of 'credit' for passing laws when those laws are kind of dumb dotting-i crossing-t kind of laws anyway.
Not sure how we're getting any credit, you don't really get anything for passing laws (you do get badges if you write them, but badges are useless and valueless too). And the person who does spot the error and correct it should get credit, so I don't see that as an issue.
That said, allowing quick fixing of grammar errors is definitely a good thing, and would mean that we don't have to repeatedly go through this rather annoying process of repeatedly drafting full amendments to fix them.
As to giving the Underhusen 'power' over Overhusen law - only in the very strictest sense of the word, where 'power' is having any ability to change it whatsoever, when the only changes that could possibly be made are the profoundly secretarial-in-nature changes of 'cleaning up any mistakes in language'.
And we hardly suggest secretaries have power over their bosses in any regard.
Except that under your proposal, the Overhusen has no power to dispute any changes the Speaker makes to their Procedural Rules, meaning that if the Underhusen decides to abuse the law to modify Overhusen procedure, they have no direct recourse. (Of course, they can appeal to the Monarch, whom they arguably represent, but this still puts the OH in a weird position of not being able to control changes to their own Procedural Rules.)
There's also the issue of principle that the two houses of the Storting should be self-governing, as outlined in the Fundamental Laws:
11. Each chamber of the Storting shall have the authority to create and revise their own procedural rules.
Of course, there's nothing in there against delegating the authority to someone else, and if the OH is fine with that, I suppose that's fine, but it does blur the lines a bit.