Aero makes one, $68 bucks with port door installed (add to cart to see price).
https://www.armorally.com/shop/ar15-assembled-slick-side-upper-no-fa-aero-precision/
A forward assist is useful after a (quiet) press check on your rifle.
If you are certain that you will never need to quietly check that your rifle is both loaded and in battery, you can probably get away without a forward assist.
That's an excellent point. You can't be 100% sure that the rifle is in battery if you're riding the charging handle back down. Being able to bump the forward assist a couple times to make sure is a handy thing to have available to you.