First thing that'd come to mind for me would be replacing the unstriped Vec<Mutex<T>> with some wrapper like:

    struct Striped<T, const StripeSize: usize>(Vec<Mutex<[T; StripeSize]>>, Mutex<tinyvec::ArrayVec<[T; StripeSize]>>);

I think I'd probably want a wrapper either way to ensure I'm always taking locks in a particular order to avoid deadlocks, anyway.