First of all, the scenario I proposed is a logical extreme for demonstrative purposes - more generally it's a bad idea and I think an unintentional one: if a party has a chair resign in the midst of a vacancy and there is a clear line of succession established, the next person in the line of succession, and
not the Speaker, should have the right to appoint.
And secondly, you're underestimating the extent to which enterprising party leaders can very quickly figure out how to take advantage of a poorly constructed provision like this. When dealing with a constitutional amendment - especially one with a matter such as this - it's very important to be as careful as possible with the language.
That being said, one particular part of your post is so asinine that I feel a need to respond to it.
Rather, it is near certain the event would happen suddenly and at a time the speaker's party could not predict. So in order to "register duds ahead of time", the speaker would have to direct certain individual(s) to not just register with a non preferred party for a few days, but for an extended period of time of months or perhaps years, in hopes that the opposing Chair-Representative might possibly resign suddenly one day.
Yes. Given the size of this game this isn't difficult to do. In fact, both parties currently contain INOs who are relatively loyal to the other major party's leadership.
Beyond such problems as these shadow members not being able to vote in their preferred party's conventions or receive automatic endorsements, and the fact they'd need to spend months deflecting questions on discord about what exactly they're doing (making it unlikely active players would agree to such a long term scheme that would have no guarantee of even resulting in anything at its outset),
so we're supposed to rely on the Discord mob to uphold fair play here? Ignoring the fact that this is the equivalent of relying on Robert Mugabe to prevent inflation, how...is this even relevant? The vast majority of registered voters in the game do not use Discord, or at the very least, not the Discord servers you are thinking of. I don't, and several other major active players don't. So why on earth does it matter what the hell Discord thinks?
It would also be highly likely that the Chair-Representative would put two and two together, realize what was being attempted, and ensure they did appoint a replacement after their eventual resignation and before their eventual deregistration.
People do emergency-deregistrations all the time. It's a sad thing, but it's not at all hyper-rare for either exigent RL circumstances or frustrations with the goings-on within the game to cause a member of it to resign from all their positions and deregister - and
very often this is done without stopping to consider the consequences to their party, who will be their successor, etc. - after all, if you have pressing RL issues or are burned out on the game, why would you care?
All of this is essentially an excuse to be lazy here. There is no rush here, and it's a constitutional amendment we're dealing with. We can and should take the time to make sure it's done properly.