1 song, 4 voices, different time signatures in each voice -is this possible?

First post - sorry if this has been covered already. Working on a 16th century motet. This piece has 4 voices, and in each part, the time signatures are different from one another. Example: Soprano at measure 4 is in 5/4 while alto is at 3/4. The measure lines are actually marked with dotted lines in the sheet music, and are staggered and shifted within each line rather than going all the way through all voices. Is it possible to assign different time signatures to different voices?
 
Or can some other time signature account for these differences in some generic fashion? Thanks-

Thanks very much for that idea - I think I can make that work.