Weed and feed only kills broad leaf weeds (dicots). The only way to get rid of Bermuda is to rip it out like you say or kill everything and reseed or sod. Not sure if Bermuda grows in Missouri but there are similar grasses in other areas. I remember the Zoysia craze in CA. Brilliant idea. Plant a grass that is known to be invasive in Florida because in CA it would be eminently controllable? That shit would form a mat that was like 8" thick of coarse ugly ass, uncomfortable to lie on grass. I used to have to go in with a rototiller set above the soil and chew it off, let it grow a bit, and then spray it out. Even still, it would get into other plants, sidewalks, driveways, cracks in stucco..... What a pain. Give me perennial rye, bluegrass, and fescue any day.