An EPG-style programmable schedule AM/FM tuner?
Not presets, no.
Basically, is anyone aware of an existing (either desk/bookshelf/portable) AM/FM, or just FM, tuner that has the capability to switch "to a station" at a pre-programmed time/day?
Plenty of tuners with presets, double timers for alarms, and lots of "typical" options. There are some -software based- (a-la SDR) tuners that can be configured to *record* specific stations at specific times, but there's nothing for "just playback".
Disregard Internet Radio as well, as there are even more software solutions for them.