I did a run like this a while back when the new rating system was just starting out :
https://www.warzone.com/LadderPlayer?SeasonID=0&PlayerID=1528045Rank Progression:Bronze : 3 games (3/3)
Silver : 6 games (6/6)
Gold : 10 games (10/10)
Sapphire : 15 games (14/15)
Extra games : 10 games (7/10)
Ended with a 40/44 scoreline and never got to emerald since it would take another 40+ games and I couldn't be bothered. My scores were very similar to Widzisz's with a few differences based on matchups so yours would probably be similar. I wish you luck on your speedrun though Phobos and hopefully you can reach emerald.