It doesn’t matter whether you want to vote for him or not. Voting third just means you vote for the worst of the two main options.
I don’t live in the US, we have multi-party system, but it’s still first pass the post, so if I don’t vote for someone normal, my vote goes to void, and some fascists can get one step closer to the post.
If you want to dismantle the two party system, voting for anyone won’t do it.
Unless you like dictatorships and want to abolish voting. In which case, just vote Trump and be honest with yourself.