Isn't the first clause already covered by this --
And isn't the second clause already covered by this
?
There doesn't need to be clauses for this, because it's either a matter of "We are either already doing this as part of one of the clauses" or "This becomes a matter of diplomacy between nations, stuff that is driven and done by the nations and diplomats."
Both the addition -- or the removal, in case some nation really shits the bed (or, well... dies, in a grim scenario) -- of a signatory is something that is the domain of the sovereigns or the diplomats.
Also, trying to make the Accords take into account something that might happen centuries down the line? That's a bad idea.
This isn't a nation's constitution or set of laws we are drafting here -- and even constitutions change over time -- this is, again, a diplomatic agreement between nations.
You can't expect this to be set in stone for centuries.
And also, if the Accords or the nations want to add or change stuff to the Accords over the centuries, then they'll do that if or when or as it comes up. It doesn't need to be in the Accords to begin with. It shouldn't be in the Accords to begin with. These are sovereign nations, not parts-of-nations or sub-nations. Don't try to do an end-run around sovereignty or the diplomats.
Also... not sure if it's even necessary, as it comes to the first clause?
"and reduce the chances of the project falling apart if Mathilde gets killed in the near future. Having a diplomatic line open should reduce the chances of hostilities between parties, too."
If Mathilde getting killed would scupper the project, then it'll scupper the project regardless of this additional clause or not. If it won't, it won't.
And "having diplomatic lines open" is already something at least some of the nations involved already have; Kislev with the Empire, and the Empire with the Karaz Ankor. Ulthuan somewhat with the others too. The presence of the accord are already a diplomatic line!
Don't try to sneak the beginning of an entire United Nations or League of Nations into this. This should be an accord for the Waystone Project. It should not be a carte blanche to be as ambitious as possible about politics and the governing or diplomacy of the nations involved.
Just focus on our job and goal. Getting waystones and getting support for them. Not forcing everybody to start forming a League of Nations or something. If the Old World wants to form the Justice League, it can start doing so decades after, on its own initiative, not because of an attempt to lay the seeds for such at what was supposed to be a magical research project for draining away and protecting against magics.
Don't try to add clauses just to make it X clauses either.
Please do not overcomplicate things, or compel the nations involved to more duties -- or empty duties or clauses that serve no real point -- just for a neat personal religious coup.