The addition operator just landed in Rust 1.66 (checked_add_signed[1]), but the subtraction one it looks like you'd need to roll your own.
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You are probably looking at it wrong. You can now write
i32::checked_add_unsigned(some_u32) and
i32::checked_sub_unsigned(some_u32)
u32::checked_add_signed solves one of the pairs (u32 + i32 -> u32), but there's nothing for the other one (u32 - u32 -> i32).
Good point, I'm sure this made sense to me when I wrote it, but I can't ask past me why.