Hello
I was also looking for a solution ; I want to be able to play VSL instrument live with my band.
I have find this :
KOMPLETE KONTROL S-Series keyboards
at : http://www.native-instruments.com/en/
They are working on improving the software and a new version is promised for "end summer"
The big question : Is it possible that VSL sends the instrument range, the keyswitches places to the Komplete Kontrol ?
Because today it is a mess to play the instrument live as you have to remember what is the instrument range and where are it's keyswitches and if you use Dimension instruments it is even worse as you have the extra keyswitches.
Imagine the problem if you play with two keyboards !
I have ask to VSL to have a set of VI to play live where keyswitches are always at the same place 
Let see if they can 
MacBook Pro 2019 16" + 2 x Odisseey G9 49" Big Sur
MacPro 2010 12 core 2.93 ghz 64 GB Mac OS X 10.11 2722 Rocket Raid Sata III card with 8 x ssd
VSL lib on a Raid 0 of 4 x 256 GB ssd Sata III - Raid 0 of 4 x 64 GB for other libs
System on a 1 TB ssd
Audio Motu PCI system 84 ins / 64 outs
Kbd : P80 Yamaha, S88 and S25 Komplete Kontrol, DX7
I-Controls Pro, 2xMidi expression pedals
Synth : many....
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Macbook pro Retina 2.7 ghz 16 GB
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Mac Mini server 10.10 (server, Itunes, WEB, and Backup )
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Logic X , Dorico, Band In A Box, ORB Composer
VSL : MIR PRO, Appassionata Strings I, Solo strings , Wind and Brass Complete, Dimension Brass, Big Band Orchestra series
Kontakt, Omnisphere, QLSO, QLSC, CS 80, Arturia V5, Maximo, Realivox Blue. CS 80 V3, The Orchestra 2, Art Conductor 5, Genesis Children Choir, Lunaris, Lacrimosa
Final Cut pro
Camera full HD