A much worse problem with this keyboard is that you almost cannot buy even regular MX-compatible keycaps for it, because the system76 people chose a really nonstandard physical layout. 1.5U Caps Lock, 1.5U Delete in the function key row, 1.5U Backspace in the number row, 1U backslash in the QWERTY row, 1.5U Enter in the ASDF row — these keycaps don't exist in most sets, except in some “40%” or ”ergo” addon kits (and even there you may not get the exact legend match for some of them, although for Caps Lock that may be a feature). 1.5U Shift is also really rare. So if you don't like the stock keycaps (which have the uniform XDA profile, and some people just don't like it), replacing them would be hard and/or expensive.

AliExpress has a wide selection.

Do you have links? I have literally spent hours there and couldn't find any flat keycap except for older Kailh mount. There is nothing to match Kailh v2 / Cherry MX mount. Only found a company on Alibaba that could make me some, but I can't afford it. I considered 3d printing old Kailh to Cherry MX adapter, but that won't be pretty :(