Ma3laaWarmfront should be voted in and metalworks should be removed. Metalworks is just a placeholder map that we've been playing for 7 seasons that no other region has picked up, despite our years of playing it.
I really dislike the way you dismiss metalworks just because it's a custom map and might not be familiar to viewers, I understand your point but it is by no means a bad thing, if we would have followed that same thought we would never have seen maps like process, snakewater and gullywash.
And on the other point you made of no other region picking the map up, I'm not gonna talk to any other region other than the one I play on, but here it was picked up, unfortunately it was replaced due to premiership players not enjoying it and wanting a change (which led to turbine and then (old)logjam, let's not talk about that dark time), and afaik other regions have done the same.
The only issue with metalworks really is that it doesn't get regular updates, I mean you've said it yourself, you've been playing this map for 7 seasons, obviously the map has gone through changes, but not enough, and now that Scorpio doesn't make maps and also has a job at another gaming company, it seems unlikely that he will unless someone actually steps up and contacts him about improvements to the map that might make it more viable.
If I were you guys, I would try contacting Scorpio as there is plenty of feedback over on the cp_metalworks feedback thread, and try getting the guy to update his map finally so it won't blow as much as you guys say it does.
I might be biased as I think Scorpio is one of the best map makers competitive tf2 has ever seen and it would be dumb not to reach out to him.