Happened to have nice small flask made out of very thin plastic. I used it for hand sanitizing as the compact size with small spraying nozzle was perfectly sized to carry on. Due to very thin material it however broke when it dropped and wanted to have something similar, so I re-designed new small bottle with that odd thread that'll take the about 20mm outer diameter orifice nozzle (ID of thread is about 17mm's). Flask also has fairly strong shell and shaped for no needed supports.

Look at the picture to get idea what could fit, they're some bizarre SPI models which this is compatible and aren't supported in Fusion and had to draw something to be compatible.

Fusion 360 model included for details. Also ready made STL is included.

Note that obviously model is the flask, not the nozzle. Just decided to share if someone happens to look for this.