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There are not very many Yamaha arrangers, Genos and SX models then they drop down into the E and EW series, so you may want to check the manuals of these to see if they do what you seek.
The Genos and the earlier S models are likely but there probably is a but in that a keyboard split in two is straightforward, to split into more will perhaps require some menu diving to limit the range of notes that a particular sound(s) can be heard,
There is the bottom of range SX600 that you may like to see if this keyboard can be split into multiple sections.
You can also do what you seek on a Korg Pa and if you ask the question specifically of the Medeli AKX10 users then perhaps one of those guys can delve into their keyboard to see if it is possible.
gwc uk has a DGX 670 digital piano which has arranger features and that may be possible on his keyboard but the manuals are a bit lacking in providing any clues.