ganchan wrote:
Yes, but they stopped making those 60 years ago. Too bad.
So?

Seems that Rudall, Prowse and others stopped making their flutes 100+ years ago and we still see those being played and up for sale regularly. I've bid on two Orkons already this year. They are merely too expensive for my bank account.

They are out there and they do change hands now and then.
ganchan wrote:
Maybe I could take the plastic mouthpiece from a small tin whistle and attach it somehow. Or attach a bass recorder bocal/mouthpiece combo (though that might require an English horn or larger)....
Highwood is correct. Reeds and horns are a different acoustic model from the flute and whistle - open tubes versus closed tubes. Optimal bore/length ratios are different too. You won't get a decent working iinstrument from a whistle head on a bassoon or oboe body.
But you can fit a whistle head to a piccolo or flute body. It's no harder than fitting a wooden flute head to a Boehm flute body really. I am sure lots of us have done that experiment. It works...and you get the full chromatic scale. Just try to find a whistle head that matches as close as possible to the bore of the flute or piccolo you are connecting to, make a connector tube that both preserve the sounding length of the keyed instrument and slides into the flute/piccolo and play. That's actually easier than punching four more holes in a whistle to make it chromatic - and easier to finger as well.
Have you tried putting a reed on the top of a whistle yet? That's good for laugh. It'll clear a room fast too.
I found a video with the Nuvo "firstnote" lip plate. Interesting take on the old "cheater".
Feadoggie