I think the crawl does not need to mention Palpatine by name at all. Because it makes the reveal not surprising whatsoever. I think it could go something like this:
After Luke’s heroic stand against the First Order, hope began returning to the galaxy and the First Order has expended a lot of resources trying to maintain fear and quell the growing resistance.
Something something about the Resistance.
As the First Order becomes desperate to find a solution to their growing problem, Kylo Ren uses one of Snoke’s old artifacts to find the source of his mysterious power.
I think a crawl in the vein of this could help justify where all of those ships came from at the end.
THE RISE OF SKYWALKER
The galaxy’s fate hangs in the balance.
Luke Skywalker’s heroic stand on Crait
has inspired countless worlds to stand
up for freedom and push back against
the tyrannical First Order.
To keep the Jedi alive in the wake of
Luke’s sacrifice, young Rey is trying
to contact the spirits of past masters
as she continues her training under
the guidance of General Leia Organa.
Meanwhile, Supreme Leader Kylo Ren
is seeking clues to the mysterious power
of his former master Snoke so he can
turn the tide of war and erase the
echos of the past once and for all…