If UW doesnt accept you DA to CS but deems you qualified to attend the university, I believe you will be admitted to pre-sciences (undeclared). Last year, my kid applied to CS (OOS) and listed CSE as the secondary and was admitted to pre-sciences, so it is still possible to gain admission to the school.
That said, if you dont get DA and CS remains your goal, the path to transferring into the CS major at UW is damn near impossible. Its been well discussed here on CC and on reddit.