Re-formable nations (Timurids, France) and their cores

[Gnostek]

As you may know, wiki states that wrong culture cores disappear after a nation is annexed.

I'd like to add this is NOT entirely true: these cores last until nov 1494 (they follow the 50 year rule, only a dead nation is reset to game start).
Is there a way to extend this date? Because even if a core would last until 1550 thanks to a recent war(I.e a surviving byzantium and constantinople), if they disappear, so does the core.
This is extremely infuriating for example if you're close to finishing off a formable nation with wrong-culture cores. I'm thinking PLC(lithuania/prussia), Timurids(most of it), France (Labourd), Spain (naples), Russia(the steppes), England (wales + ireland)...

Basically, if you want to revive a nation to its full potential, you have a 50 year deadline, and in some cases it's just not possible (AE+total development to take, etc)

 

[Vetgirig]

Just conquer one of their provinces and then release it as a vassal.

 

[Sunspawn]

Just conquer one of their provinces and then release it as a vassal.

Those cores are still going to go away at the same rate though.

 

[Gnostek]

If you release them as a vassal you cannot re-form them, as in, form that nation by decision, which is the point I'm trying to make

 

[Sunspawn]

If you release them as a vassal you cannot re-form them, as in, form that nation by decision, which is the point I'm trying to make

You can just annex them and THEN reform them by decision. Thinking a bit more, it actually DOES help you with that, since Reconquest CB has a large -AE modifier and reconquest does not cause rebel issues for the vassal.

And if you yourself are somewhat weak, you can always grab 1/2-2/3, annex and then demand the rest to be released in another war if the cores are about to fade and 1/2-1/3 is still too much AE/OE to gobble in one bite.

 

[Vulkandrache]

So lets say you want to form France as another country by culture shifting.

What you do is this:
Start conquering them as AE permits, put all their cores into a Vassal, except the provinces needed to form them.
Core those yourself.
The cores on you Vassal reset every time you go to war.
The moment you full annex France you have everything prepared to culture shift and form them after your cores finish.
This gives you all the cores on your Vassal, allowing free annexation.