I don’t follow every TROS thread so I apologize if this has already been posted elsewhere, but I’d suggest giving this a listen. Essentially it’s Ian McDiarmid saying a line from an old version of the script that pretty much confirms Palpatine is a clone. The line is: “More than a clone; less than a man.” He does it in character too, which is tight.
The audio definitely isn’t amazing, but perhaps some wizardry could be done to make it usable?