If OP is going on stage, he could cut it down to only Mac Mini and 1 screen. Mac Mini is about the size of a guitar pedal these days. And if stage is the big play here, he can get a 13" screen (
one example of many) to be the same size as the iPad for about $1000 LESS than the iPad.
In post #5, OP specifically references the desire for a bigger screen than the 11" he already has. 13" is bigger but 17.3" is a LOT bigger. There's plenty of sizes between those if 17" is too big. This idea offers a path to that for a
LOT less cost than the bigger iPad Pro.
Besides addressing that problem in a bigger way, Mac mini would also be capable of running the desktop incarnation of Logic Pro or GarageBand, both of which are arguably superior to iPad versions in many ways.
I suspect if there is a page turner foot switch that works with iPad, there's one that works with Mac Mini too (
yep and
another and there are likely many more).
Mac is generally much more functional & flexible than iPad. macOS is generally much more functional and flexible than iPadOS. I'm not saying OP should absolutely go this way... just offering that they
could... and enjoy all of the "full computer" benefits too instead of the more limited benefits of iPad. And I write this while owning Mac and iPads myself, so nothing particular against iPad. In fact, I use my own iPad every single day.