Interesting article about the Mars clouds, above, too.
Yes that is interesting, the question is, are they visible from the ground? Do they drop precipitation, do they have lightening like our clouds, if you were in one would it appear like clouds on earth? In other words would the typical "cloud" pattern be suitable as the OP suggests, it appears from the article that wouldn't be the case so. The description of clouds here doesn't fit the typical "cloud" idea that we have from clouds on the earth so the OP's idea still wouldn't fit.
but I'm relatively sure they can exceed 14 kilometers in height
Yeah I was going on articles about observatories and mountain tops and clouds that traditionally affect them, it seemed to suggest cloud height would of course vary with temperature and other factors, in fact clouds heights may actually be affected by global warming and that limit may be higher as the global average temp increases. But....not traditionally visible higher clouds do seem to exist.
Noctilucent Clouds seem top be the closest match to the clouds on Mars;
Very thin cloud composed of water ice. These clouds are the highest clouds in the atmosphere, located in the mesosphere at an altitude of approximately 280,000ft. They are only visible when illuminated by light from below after the sun has gone below the horizon.
So that's as high as 85kms, however the point being, you can't see them during the day and lucky to see them at night I suppose, I am surmising they don't have lightening or the traditional features we associate with clouds, so they wouldn't be suitable to being recreated using lagrange clouds and the lightening effects associated with them. As far as we are concerned having them in the sky above it would look exactly the same as not having them at all, so what would be the point of FDEV creating something that basically can't be seen and doesn't affect anything. No rain, no snow, no lightening, invisible....pretty pointless really.