Having thought about it a bit more... the way Coloradians can fix this is to contact their local state legislature representative and ask them to appoint electors in such a way as to represent the popular vote for Trump, that is, to change the law so that this Colorado Supreme court decision becomes moot. States vote for presidents via their electoral college representatives, and they are chosen according to whatever the legislature decides. So the Colorado State legislature can effectively bypass the Colorado Supreme Court. And if that gets challenged, the US supreme court will enforce.

Colorado has become a blue state anyways so it's probably not relevant.