No copy and paste into bars it's not going to be. 

Headphones. One ear listens to what was recorded; and analysed, while the other ear listens to the live being recorded. 

That way each individual note for each voice or instrument, constantly changes, instead of the copy and paste. Copy and paste is one reason why Computers and Piano's don't mix. But hey, Korg offers customized sound creation abilities. A Mini Grand would be ideal, but it only has one voice. :+) 

Sample patches banked as 'accents' and 'high lights' for here and there throughout each album, so as to break apart the similar structures, as well, splitting octave pathways for threaded -+ branching's.  

Start: Computer + Midi + Keyboard...

The reason I like KEXP so much regardless of Genre. Live! Though there are fingers pushing presets. 

Some places, the keyboardist plays the keyboard more than the keypad. 

Like Bam!!!

The Real Reason Why Todays Music Is Starting To Sound The Same

https://www.youtube.com/watch?v=JZgPKGVJrdc

One work around would be a channel switch board, and create personalized patches for Voices to load onto Keyboard. Old School Korg...  :)

Volume. More perfection = Right Angles = Right Angle BLOCK. Everyone in the studio has the 'right angel' on how to do stuff too, these days. The larger the right angle, the less variation and more sameness.

My theory, is to record each layer live. Drum layer. Play drums on keyboard or pad. Entire track. Next voice or instrument. Listen to what has been recorded, analyze, play next voice or instrument by layer on top of what has been recorded. 3rd Voice or instrument. Same. Listen to what has been recorded, analyze, and then play 3rd layer voice or instrument live on top of track as layer. Master, etc, then a live compiled track is had. Each layer recorded in real time, live.  

For a one person crew, this would take extreme work. For each voice and instrument has a unique wave envelope. It is what happens when playing the piano. It's real time. Sit down, play, when Golden Ratio spirals out of phase, stop. Threading these layers together into a weave would be nothing but 'feeling', with little technicality combined. Experimental... Which Music needs more of...