Just a thought about something I could use: a Reface XG.
A Reface family member with XG voice ROM, 16-part multitimbral, decent polyphony. Combine this with the reface portable form factor, the small but very playable keyboard, the USB/MIDI interface. Now that would be a nice songwriters tool, when connected to a computer or tablet. It would be a new generation of the CBXK1XG