Um, so, I read the documentation of KM on Stream Deck and it seems to only works if the USB detects Stream Deck key. Will this work with the Mobile version "wirelessly" then? 
I will try it this weekend since they gave a 3-day trial free.
Edit: got home and tried the trial..
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setting up is easy. Download the Mac Stream Deck software, click on the "Add iPhone" in the software and then take a photo of the QRCode from your iPhone and they are paired.
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the iPhone stay powered on and does not go to sleep - that's a good thing.
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the icons shown on the iPhone is "ugly":
I may be nit picking but look at the Mail icon and the KM icon - the rainbow in the latter is jagged and pixelated. Both are icons which are available as default from Stream Deck. Things icon is my own doing - I captured a screenshot from the website and saved as PNG. It is blur. Unfortunately, I cannot select from Application icon.
I think in the actual Stream Deck hardware, this might be fine because the hardware is smaller and its further away from you on the desk. On the iPhone though, with the sharp and bright screen, it's very obvious.
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Installed a KM plugin and you can drag the KM button to the Stream Deck
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Seems to work pretty easy enough:
Also, base on the App Store updates, the app was updated 3 months ago. I think it's probably safe to say that the updates may not be as frequent.