Thank you so much, Lillie and all the others, for adding further refinements to my little trick. I should add that Ricardo Matosinhos has also shared a tip to execute a similar sleight of hand using the playing techniques editor. It is to be found on the FB site. While it is a graphical solution, it has the advantage of not messing up multirests should one not add musing on the individual staff with the different TS until a few bars after the meter change.