The problem with The Feast chat, let's solve the problem from the roots.

[TiramisuMacaron]

Not if it doesn't give any points.

And still, making 1 or 2 weeks of pre-season will help too.

Lots of players play feast because of the gametype and the faster queues than FL (not anymore, rip). Lots of players don't care about rank, and just want to PvP, you'd still have to attach elo to normal mode or else you'll have 2m steamrolls constantly. It would split the player base, normal would pop faster, people would Zerg ranked the first two weeks and then only play normal.