I'd say you'll need to ensure the additional plates will have to be fixed to the clips in several locations so they are completely solid and as one unit. If not, you may get vibration issues.
Cooling should be ok I guess and not really an issue. Might be worth doing a few checks once fitted and if the brakes are getting too hot then simply revert to your old clips or maybe add some small vent holes on the face of the clip.
The only potential major problem I can think of is how to remove the clips when they're on if you have the plate covering them. You'll need to ensure you can pry them off from the inside of the caliper (where the disk goes) once you've removed the unit from the hub..