thanks to the genius of a frind of mine (Grazie Mario!),
I just bought this small inexpensive item at IKEA
"RATIONELL VARIERA" for about 5€.
a kitchen's tool design for store neatly lids and pottery....
well, it perfectly suites as flutes and whistles stand!
closable, not too heavy, enough stable to keep even a single assembled flute
and could be useful for to keep single pieces while oiling too!
maybe could be also use on stage :- )
very very nice and... cheap!