Export with lead-in

I was working on a preliminary mix and wanted to make an export (single wav) that I can send to others so they can prepare their (additional) parts.
The thought occurred to me that it would be nice to have a couple of measures lead-in in the exported file. This is fairly easy: Select everything, shift everything a couple of measures, add a midi track, add ticks, etc. Or bounce the metronome etc…

But I won’t be surprised if there was an easier way to do this.
Is there?