Didn't they pull MSMA off the market?

It's still available, but it's not labelled for homeowner use.

I have 15 acres so I am able to buy at the farmers coop.

Can the two be mixed in the same tank? I have other weeds that MSMA covers but would like to only spray one more time this year.

I don't think we can give you a solid yes or no as to whether they can be mixed in the same tank. I would trying out in a small glass container first to check for reaction & if there are none, go for it

Nutsedge is a swamp type grass which does not rapidly take over in a normally watered lawn. How frequently are you watering?

I don't water at all and I'm inundated with nutsedge. Mother Nature did not get the deep and infrequent memo, it just dumps water for 10 days straight and then drought for 3 weeks.

I think nutsedge is also much easier to see in bermuda than it is in other grasses

Could it be you have green kyllinga and not nutgrass? They look identical until they flower. Here are nutgrass flowers (Link to NC State University page for nutgrass) .

Below is green kyllinga (Link to NC State University page)

I have had green kyllinga growing in places that never get anything but rainwater. Even with our prolonged droughts, that stuff persisted. It never really thrived, but it never went away. The NC State page says gk likes swampy conditions. The gk survived in the heat and dry soil where nutgrass did not.