My post explaining how to hack a regular whistle to transform it into a nose flute seems to have germinated and made some followers (cool!!). And both used a yellow whistle :)
Don Luis, amateur nose flute maker, took a referee one, and made a video :
Shuen Ping Chiou, aka YW, modified also a yellow plastic whistle, but, as he stated, he was « a little shy to put it in [his] nose. So [he] did a little bit of change ». Indeed, he used hot glue to form an ergonomic nose saddle.