Dual Wielder with Great Weapon Master

I am playing a barbarian and really wanted to look of dual weapons without sacrificing the power output of the classic PAM and GWM build.

Here is what my DM and I came up with.  GWM applies to heavy weapons, none of which are one-handed so, enter the Warmace.

WarMace

-30gp

-Martial weapon 

-1d8 bludgeoning 

-6lb.

-Versatile (1d10) 

-Heavy

-Special (must have STR score of 18 to wield one-handed)

To close off the build without having to take Fighting Initiate (Two Weapon Fighting Style) as a 3rd feat here is modified Dual Wielder Feat.

Homebrew Dual Wielder Feat

You master fighting with two weapons, gaining the following benefits:

1. You can use two-weapon fighting even when the one-handed melee weapons you are wielding aren't light.

2. You can draw or stow two one-handed weapons when you would normally be able to draw or stow only one.

You must chose between the following

Either

- You gain a +1 bonus to AC while you are wielding a separate melee weapon in each hand.

Or

- When you engage in two-weapon fighting, you can add your ability modifier to the damage of the bonus attack.

What do you think? Balanced or broken?  Looking forward to your input.