Before I brought it up last week, the last time that balloons were mentioned was July of last year, not counting the last time
I asked around about it in November 2020. No one else was thinking about it. I'm also not counting all the times after that you mention balloons in your weapon designs since you never described how to make the balloons with our current knowledge or suggested that we develop them.
While I was searching around I found designs Jelloraptor made for a
seal-powered hovercraft using modified air seals. We could probably modify a Usamatsu's Glorious Life-Saving Preserver or an Air Cleaner to continuously output air without too much trouble.