Doctor Strange Portal Kill Achievement Help

I am trying to get the Dr. Strange kill with a portal, but I am having no luck. The cooldown is absurd for even attempting to do so, and you get maybe 2-3 tries per match. I've tried placing it while on defense at the spawn door hoping some new player will fall into it... to no luck over 10 matches. And not every map even has a death pit to drop the enemy into.

I've even tried asking nicely to see if an enemy would help me out lol. Haven't gotten a volunteer yet.

I was hoping some Dr. Strange expert had some sage advice for me, and anyone else struggling to get this achievement. Like, is there a spot on the Doom Match map to trick someone?