Sequential mixed 9/4 and 6/4 meters same for all voices

Hello,
I have sequential polyrhythm, mixed 9/4 and 6/4 meters same for all voices - i.e. the 1st measure is 9/4, 2nd 6/4, 3rd again 9/4 and so on.

How can I do that in Musescore avoiding putting the local time signature 6/4 in front of each even measure (which makes the sheet terribly ugly)?

Thanks!