Our swing plane is just like a circle that moves from horizontal to vertical but we must keep that circle on the same plane throughout our swing
Changing your grip is uncomfortable so the best place to work on it is at home, holding the club a few minutes at a time until it feels comfortable enough to swing with
Do not practice before a round the same way you would if you were working on your mechanics, get target oriented and play a few shots with ever odd or even club to a target, then play with the swing you have that day do not try to change it prior to the round