EDIT: Your five suggestions are all good. Our (one) kid is trilingual (Spanish & French), but fuggitaboutit teaching her Mandarin, or *shudder* coding...
Staying out of debt is (properly) at No. 1 on your list.
May large cities on the coasts in the USA have Chinese school which is essentially 2-4 hour Saturday school.
There are options now for teaching your children coding for parents who like me are coding illiterate. Below is the one I am using.
https://www.codingwithkids.com/#!/