Shuenping Chiou (YW), our friend from Taïwan who likes to invent and build special nose flutes, has produced a « range adjustable nose flute ». On this purpose, he coupled a nose flute and a big syringe, forming a slide nose whistle.
The principle is to allow a modification of the size of the resonance cavity 'by default' (increasing more or less the air volume of your mouth). So, with the same mouth opening, you would get different notes, depending on how you set the slide).
Here is the test video:
This idea was patented by Joseph Goldstein in 1926, but we don't know if the model was manufactured.
Also, Maikel Mei had tried a such a device, but a bit more complex, grafting a slide and a recorder to a nose flute.