I believe Poppa’s TLJ Rekindled has the most Palpatine foreshadowing in it.

As well as all of Hal’s Palpatine references you could also add the Palps “find me” on the radio that Kylo hears in the Crait base at the end of TLJ that Poppa added to add more foreshadowing so Palps doesn’t suddenly appear out of nowhere.

Also, just my own personal preferences if you are willing to add them in the edit:

In TLJ, add Luke’s third lesson from the deleted scenes where Rey runs into the Caretaker nuns camp holding the lightsaber
At the end of TLJ, instead of showing Rey moving the boulders from the cave (with only 2 days of training) have it appear as if Luke is using the force to remove the boulders and saving the resistance (maybe this is what kills him in the end).