I guess I shouldn't have been afraid of generics (they get everywhere)
```rust
	let x = FlashWrapper {
		magic_start: 1,
		data: MySettings::default(),
		crc: 2,
		magic_end: 3
	};


#[derive(Debug, BinarySerde)]
struct FlashWrapper<T: BinarySerde> {
	magic_start: u64,
	data: T,
	crc: u64,
	magic_end: u64,
}

#[derive(Debug, Default, BinarySerde)]
struct MySettings {
	foo: u8,
	far: u16,
	flag: bool,
}
```
This appears to work well enough