Best way to setup 70 songs setlist for live performance

[brk303]

We're going to use Reaper live for automated effects and backing tracks. The plan is for singer to use a tablet with Bandhelper for navigation between songs.
On song selection Bandhelper can send Midi information and I can map it to action in Reaper.
So the plan is to have a repertoire of 70 songs to choose from and being able to navigate to selected song.

Now the question is how to best organize this ?

I could think of few approaches:
1. Make one big project with all 70 songs and then navigate via markers and regions, but there are "only" 30 markers available.
2. have 70 separate projects and load selected one, but how can I load selected project ?
3. Subprojects ? Don't know enough about them, could work, but again not sure how to select the correct subproject.

Any ideas or tips ?