With regards to my ideas of how to end Ahsoka, I just figured out a way to even explain how Papa Palpatine is still alive.
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[Set - Star Destroyer bridge. Chaos is everywhere, as the Chimera has been destroyed and Thrawn is dead. An Imperial officer approaches the Commander]

Comms officer: “Sir, we’ve just received an unusual signal via relay. It’s like nothing I’ve seen before, so I thought you should take a look at it.”

Commander: “What’s so unusual about it?”

Comms Officer: “It’s from the Unknown Regions. And it’s using a code I’m not familiar with. It looks….well, sir, it looks like old Imperial codes.”

Commander: “Very well.”

[Commander and Comms officer walk to comms station. The Commander looks at the code, enters his encryption key, reads the message]

Commander: “This isn’t possible.”

Comms officer: “What sir?”

Commander: “This is a command to withdraw to coordinates deep in the Unknown Regions and to do so immediately. You were right, it is indeed an old Imperial code. It’s the code of the Emperor himself.”

Comms officer: “That’s impossible - the Emperor is long dead!”

Commander: “This code was only known to the Emperor and no one else. It was to assure that a direct order from the Emperor could not be counterfeited. Not even the ISB would’ve been able to duplicate or reproduce it. Not even Lord Vader.”

[Commander thinks for a few moments as to what to do.]

Commander: “With Grand Admiral Thrawn dead, I hereby take command of the fleet. Prepare the fleet to go to hyperspace, and send the coordinates provided in this message to the other ships. And tell no one of this conversation, absolutely no one. If asked, this was on my authority and I take full responsibility.”

Comms officer: “Aye, sir.”

[Exterior shot - Star Destroyers begin jumping to hyperspace one by one. Fade scene]
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What do you think?