Contact TKS or Thermalwing-- they should have an answer since they sell the product.
What are the rules regarding known icing and experimentals.
I don't know the real answer to that but I THINK the answer is
you'll never get an experimental approved for known icing.
Part of (the main part) of known icing certification as it was explained
to me is that the airplane has to continue flying xx (20?) minutes after
a complete de-ice system failure at yy droplet size at zz accumulation rate.
I'd guess that's a flunk for any skinny wing plastic airplane.
On the other hand, where I live, you are not going anywhere in the winter without
going through a few thousand feet of cloud that is in the ice making temp range.
Leaving out the freezing rain days, clear ice days, and ice to the ground days,
de-ice capability would make an operational difference.