I don’t think I’ve seen anyone mention this, but it looks like Amazon has these now. Sold by a third party seller called JOYJOM but reviews seem to say it’s legit… Shipped by Amazon, so I’m confident enough to give it a whirl on my 11th gen. I’ll see if my results line up with what’s described here!
US - https://www.amazon.com/dp/B0BRJB8JNX
CA - https://www.amazon.ca/dp/B0BRJB8JNX
UK - https://www.amazon.co.uk/dp/B0BRJB8JNX
(Probably more, but that’s all I’ve bothered to check 
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