A total of 3 reviews of this product on Reddit.
Was able to do some testing this morning. I got the set below when I was planning on keeping a k6. The alpha keycaps from this set fit perfectly fine on all of the switches that don’t have stabilizers. They don’t bottom out! They’re a little taller than the Keychron keycaps that come with the k3 and a little shorter than the standard Keychron oem keycaps from the k6. I tested a number key also from this set which is almost the size of the Keychron oem but a little shorter. It looks like it just stopped short of bottoming out but it’s very close so hard to say for sure.
TLDR: if oem style cherry keycaps are out there that are a little shorter than oem they will probably work for all keycaps except the ones with stabilizers (Space bar, shift, caps lock, backspace, enter)
HK Gaming Dye Sublimation Keycaps | Cherry Profile | Thick PBT Keysets for Mechanical Keyboard (139 Keys, Stealth Dolch) https://www.amazon.com/dp/B08BKS7L4K/ref=cm_sw_r_cp_api_glt_fabc_SC3MQRHT81DKYPCP93ZW?_encoding=UTF8&psc=1
It looks like the Stealth Dolch: https://www.amazon.com/HK-Gaming-Dye-Sublimation-Keycaps/dp/B08BKS7L4K?th=1
Maybe you could use the command on these