change my corsair mkb's keycap into pbt and never looked back. very stisfied

key caps of corsair boards are really of low quality. it's a pity really. corsair have charged premium for them, yet they cannot afford to make gaming boards whole with a better quality key cap set. yes it's about costs, but we are not asking for gmk.

grab one better set from taobao, or just do rma if the warranty is still valid.

yes you can use aliexpress.com, you can try with keywords like 'pbt double shot'. just don't go for those usd9 ones because those are damn thin pbt caps.

np; if you're in doubt just show me the links i can verify for you if you want (because i saw thin caps sold at much expensive price tags also at taobao)
pbt double shot consists of 2 different plastics

i think this one is good.

g810 uses their own stems. it will be hard for you to find compatible replacement key cap sets.

you're right. it's a terrible choice for them to decide on putting something with bad quality that are interfacing users directly. (it's the cheapest of all parts in that board some more)

i have switched my k70 rgb to pbt double shot also, because of its ugliness after few months of use (abuse). (the paint is too thin tbh; worn off after some time)