Is there any way to make the clock display larger? Its too small to read easily.

Ideally I'd like it to be full screen, such as the background or wallpaper, or take up the entire display when other functions aren't in use.

No

Users Manual owns you OP. The vehicle dynamics mode has a large clock on it.

I'll chime in with a somewhat relevant gripe here. The clock readout on the Z2 (and Z1?) is completely counter-intuitive. Note that it only does a 12 hour display, and yet they felt the need to give it a leading zero if the time is before 10 o'clock. e.g.:

05:41

Maybe it's just me, but I use 24 hour time a lot in my job and seeing a leading zero automatically makes me think that it's an AM time that I'm looking at. That said, it's not as if I look at the clock and think it's AM when it's clearly after 12 noon

It's yet another one of those small annoyances with the design; some things are over-engineered for configuration (e.g. the vehicle dynamics screen) and yet the clock display is not configurable for 12/24 hr time and uses a leading zero.

oh welps, if the magic Pioneer update pixies decide to fix something else more critical, I think I could suck it up