Key changes (modulations) within a song

One way to make a song more interesting is to modulate to a new key. Is there any way to notate a key change in iReal other than just ignoring the "Key Signature" setting and typing in the appropriate chords (and maybe putting a text comment that says "KEY CHANGE")?

One way I've handled this in the past is to create two charts, call them "Song_Title_Page_1" and "Song_Title_Page_2" and put the modulation at the end of page 1. Unfortunately I don't think there's any way to have both page 1 and page 2 playback as a single song.

Suggestions?

This is what I usually do on charts that have key changes. I write as text comments "key chg: 1 step up)" as an example.