The B707 had to have a fairing placed at the underside rear of the fuselage to help with the excessive rudder forces before it was allowed on the british register. Other airlines demanded the same modification before delivery.
The model with the undesirable pitch up was the B747, which was also modified before being allowed on the British register.
This is how it should be done, an independent regulator with proper resources, free from commercial pressures tests and certifies new aircraft. I doubt D.P. Davies would have accepted the MAX after reviewing the MCAS system.