No, this is not possible. You should learn the difference between client-sided and server-sided processes. You open key on your client, but it requests from the server to pick from a list of items, and even then each unusual is a 1% PER crate... now for a specific effect? That's 1/66 (0.01515151515)..... so (0.01 * 0.015) = = 0.000151515152
= 0.000151515152 * 100 = is a = 0.0151515152% from EACH CRATE YOU OPEN to get X hat with Y effect...
This will never happen, and this should also make you realize how little of a chance you have to get a burning flames team captain.