Looks like the switches are MX-compatible, meaning most keycap sets out there would fit it. Look for XDA or DSA profile blank keycaps. Those will have the advantage of having no difference in profile between rows, meaning a key intended for the bottom row will still work for the top row etc. They can be found for cheap on Amazon or AliExpress.

https://www.aliexpress.us/item/3256805087525292.html

https://www.aliexpress.us/item/3256803005644566.html

https://www.aliexpress.us/item/3256805227768132.html

XDA and DSA are some of the lowest profile but I managed to find a few sets just not blank. You can also buy XDA in different blank sizes but you have to order 1u 1.25, 1.5 and so on in the numbers you need they dont generally have prebuilt blank sets.