What kind of number are we talking about when saying ‘not that many’ songs? Some say this for a few tens, some a few hundred, some say it for a few thousand! My gig playlist is about 400 distinct tunes, but I have other Perf. lists optimized for live band play, Xmas tunes, and different singers I’ve worked with. In fairness, a few dozen entries takes next to no time (maybe a day or so, which is FAR less time than you’ve spent just trying to figure out the bass inversion toggle issue) to create so you have everything set exactly the way you want.

The problem with using OTS is that they are stored in the style itself, not the Performance, so if you want a style to have different OTS for different songs, you need to create a user style for each. That means a lot more styles in the sub-folders (and using sub-folders necessities a LOT more scrolling and pressing to navigate on the fly) because you cannot overwrite a ROM style, nor place the styles under the style category buttons. They MUST go on the stick, which means a lot of navigation on the fly.

If you’re only doing a few songs (whatever that means!) I think you are making things massively complicated using holds and hand selecting styles when simply creating one or two Performances per song and that’s the ONLY thing you need to select. The Performance for one thing will call up the style no matter where it is. Which calls up your OTS. Which calls up ALL the settings. Which calls up any Tone you want initially before you engage the OTS. No holds needed.

And if you want to move to a different Performance (for another song or an alternate keyboard layout) without changing tempo, rather than using holds, a long press on the tempo button engages a ‘lock’ which can quickly be defeated again before your next song.

I think you are massively overthinking this, when the Performance list automates basically EVERYTHING, and reduces the whole lot to one button press.

By the way, how are you succeeding getting a momentary toggle out of the dual switches to move Perf. Up/down? I didn’t think that could be done, each is a separate function…
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An arranger is just a tool. What matters is what you build with it..!