The Mitsuboshi belt in the kit isn't exactly like the OE belt from the Toyota dealer, but it is still high quality. There is nothing wrong with using the Aisin kit
Also, your 1MZ is non-interference, so you don't have to worry about that
Get the Mahle valve cover gaskets and, if you can find them, Bosch Platinum Ir Fusion spark plugs, part #4501 or 4503. They are different by one heat range, but either will work. Get the NGK wires.
Yeah, the Bosch plugs seem like a gimmick, but they are THE BEST plugs to use on a 1MZ if you don't want to do this job all the time! They are the ONLY multi-prong iridium made for wasted spark engines! OE is a 2-prong platinum for 60k, so a 4-prong iridium is a big upgrade and should last at least 100k!