Modifying metahuman beyond creator

I have a metahuman character based on a scan, i’ve replaced textures in UE 5.1 and imported a live link recorded facial animation via the new importer (csv file)
when it speaks i’ve noticed the teeth on the top jaw are too low, i want to modify them.
when the control rig is active there is a ctrl_C_teeth_U controller that will raise the upper gums/teeth… but if the control rig is deleted (which you have to do, to make use of the loaded live link animation) there doesn’t seem to be a way to raise the teeth… am i missing something?
there isn’t the level of control in MH creator to raise the gums/teeth, i can do it in maya, but not sure about how to get the adjusted asset back into unreal to then make use of the livelink recording…