Stickerboy just posted iPad 10.5 skins today. I've used their skins on two MS Surface devices. The material is pretty thick compared to other brands. Back only for IPP 10.5 is $14.95 and there's a promo code for 35% off. (SB has consolidated all sizes of Pro skins under one link, ignore 9-7 in link below.)
https://www.stickerboy.net/collections/ipad-pro-9-7-skin-collection
DecalGirl still doesn't list skins for IPP 10.5.
I have one of the Moko clear flexible cases that fits with the ASK and it's awful. Based on a recommendation earlier in this thread, I've ordered a CTsing one, which will arrive Sunday. I'll whack the cover off it so my ASK will fit. Although I wasn't happy forking over for the Apple silicone back cover for my IPP 9.7, the silicone back cover with ASK is the perfect combination for my IPP so I am very disappointed that there is no Apple silicone back cover for the IPP 10.5. The Apple brand cover has a pleasant feel, fits perfectly, all the buttons are covered, the speakers are covered with matching holes rather than a cutout, and all the openings fit perfectly. It doesn't pull away from the edges when you handle them, either.