Soap Bubble Vortex Rings

On a previous idea posted by [ShawnBob], [link2], [MB] postulated creating soap bubble vortex rings and we started to discuss whether it was possible.

As seems to be the way with these things, it took a bit of percolating, but it may have dawned on me just how to make that scenario happen.

It would be easy enough to make a vortex ring launcher and try dipping it in a soap solution, although I highly doubt that the airflow wouldn't be too great to allow a bubble to form so I'm not going to try that.

What about a foam cannon though?

I might be able to launch a vortex ring of suds which should remain cohesive long enough for the bubbles, which 'will' pop under the stress, to self sustain an outer layer long enough to wrap into a torus, attain a stable level of rotation, and create a single layer of soap film wrapped around the vortex ring without popping.
Maybe a multiple bubble outer surface slowly merging into a singular bubble over time, I don't know, but so far it works in my head.

Now imagine using low temperature steam to fill the initial foam.
When launched the vortex ring would be temporarily lighter than air and lob high overhead.
As the steam coalesces and cools the torus will shrink and fall Earthward.

Make the vapour visible and explosively fog the distant crowd at your next festival.