Yes I just saw the kill switch on an EX on Youtube and found it on the Stark spare parts store.
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starkfuture.com

FYI, I have an EX in France and we don't get this kill switch in EU from what I've seen.
I received mine 1 month ago and I love this bike more and more the more I ride it.
Today was my first enduro ride and I loved it, it makes my life so much easier as I have a small paralysis on my left foot due to a very bad spinal injury in MX 2 years ago.
I don't want to be rude but I think you're too old school if you're still after a clutch

Personally I don't want it and I love the rear hand brake so much but again it helps a lot as I lost a bit of sensitivity in both my legs and gain neuropathic pains...
But I understand that it could be quite dangerous/harmful to loop the bike by accident, I almost did it once by pushing the bike on the side and thinking it was on neutral.
Now it's the first thing I check before I get off.
I would be very curious to try your footpegs and see how it change the balance of the bike.