The mini-Plume is lovely used the way you're thinking......have you considered the Plume Elan? This is a rectangular Plume that is perfect also for what you're looking for.
Yes This would be wonderful info to knowI've heard that the largest Plume size is 32cm, and you can special-order 40cm Plumes but they look like suitcases. Anybody else have some info on Plume sizes? And what dimensions are there in a Plume Elan?