I ended up getting my wife one of these (in red, to match the X). It's nearly identical to the cover that came on the fobs for our S, and we both liked it more than the big silicone fob covers (like made by AO).
https://www.amazon.com/gp/product/B07KPZ5DSZ/
I found a lanyard on an old USB drive and put that on my X fob (I nearly bought the NoCutKey one).