Good idea but I dont think theres any need to hard restrict it to 2/2/2 though since alot of other things like
1/3/2 are more fun to most of the playerbase
1/4/1 Can work but is slightly suboptimal.
And anything with 5dps in my experience never gets played in Open queue anyway because its a hard throw.
You just need 1 of each role minimum.
That or you just restrict tanks and leave it the same as regular OQ to prevent goats.