This puts the cart before the horse. At least one important question to answer before. Does something absolutely needs to be done? Then we start looking into the best alternative.

What's the concrete threat scenario you avoid by moving to the Venusian clouds? Global warming? Fix it on Earth and if you can't convince people to agree on a solution here, how will you convince them that a Venusian balloon is the best way forward? Nuclear annihilation? Probably digging deep underground is better. Total planetary annihilation? Maybe stations in Earth orbit, or Moon's poles, or L point, etc.

Are we looking for options for which we have the technology and capabilities today, or a few centuries from now? That changes your options from "balloon on Venus" to "terraforming Venus".

The engineering and other practical considerations needed to get such a "station" a realistic chance at long term survival are about as sci-fi for us today as the starship Enterprise. We aren't even at the point where we can sustain an isolated Earth based colony indefinitely in an inhospitable environment. They all need constant maintenance and resupply from the the hospitable environment just a stone's throw away.