If this is for score only, the N-tuplet should work fine for what you need. It's in with the triplet notes in the part box, last item. Drag it over first note and a box opens. Adjust parameters for your quintuplet. Should work.
That is what I tried to do. I selected the 5 notes and pulled the N-tuplet thingy over it but when I chose 5 in 4 and 16th notes it gave me the "Tuplet exceeds measure" message. I even tried 32 notes and still got it.
Make sure your notes are evenly spaced (they look pretty good, actually).
Make sure you don't have a user rest or some thing else not obvious to affect the rhythm.
Crazy as it sounds, you may have to delete the notes, re-enter them and it will work......
Look at my settings in attached screen swipe.
Thanks a lot. I'll have to play with it some more. That actually is pretty good general advice for many things. Sometimes it is better to stop beating a dead horse and start over.
The job was a rush job and is now finished. It did cause some confusion with the players, but eventually it got translated and through to them. I was in such a hurry. There was no time to put phrasing or anything.