Old Hollywood blooming transition fx

Howdy. We need to create a transition between shots, currently in the offline as a dissolve, but with the look and feel of a vintage Hollywood optical print blooming transition. I can put this together manually, but curious if there happens to be a Matchbox or Flame tool or Sapphire that might already have it sorted to start with.

Gemini gave me a quite good answer:

https://www.google.com/search?q=old+hollywood+film+optical+blooming+transition+effect&rlz=1C5OZZY_enUS1133US1133&oq=old+hollywood+film+optical+blooming+transition+effect&gs_lcrp=EgZjaHJvbWUyBggAEEUYOTIHCAEQABjvBTIHCAIQABjvBTIHCAMQABjvBTIHCAQQABjvBTIKCAUQABiABBiiBNIBCTE3MjY0ajBqN6gCALACAA&sourceid=chrome&source=chrome.ob&ie=UTF-8

Once I specified that I’m using Flame, it did respond with a couple of MX options.