SOLVED: As suspected, the 2nd row seat flip switch and the clock are, in fact, on the same fuse. I overlooked this fuse so many times. I've downloaded and printed the SE and PG sections of the FSM and have read and re-read the wiring diagrams and could not figure out where the fuse was located.
I finally looked at the end of the PG chapter because I wanted to look at battery info, and lo-and-behold there were diagrams of the actual fuse blocks! I could tell it was located on the driver's side because of the connection numbers and where they connected to the main harness. At first I thought it was behind the driver's kick panel, but when I removed it all I found were harness connections. Then I looked at the fuse block in the lower dash and looked at the diagram on the cover, and there it was: the long-term storage disconnect at fuse location 6! I gave it a push, and it re-seated the fuse, and both my seat switches work and the clock has started running!
Thanks to Rogue One and marctronixx for your suggestions and help with the FSM SE chapter direction.