Bacchus
You answered your own question. Easier and cheaper to sell a single Manuel which is good for home or pro use. Want a second keyboard or pedals , that's what Midi is for.
I do it all the time with myBK9. For gigs just the BK9 ,, for home I use the bass pedals.
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Bill in SC --- Roland BK9 (2) Roland BK7M, Roland PK5 Pedals, Roland FP90, Roland CM30 (2), JBL Eon Ones (2) JBL 610 Monitor, Behringer Sub, EV mics, Apple iPad (2) Behringer DJ mixer