Instead of searching worldwide for pike floats, why not just buy a length of dowel the correct diameter. Cut a piece to length, and either spin it up with a drill and shape the end with a file or just hand shape it with a file.
To spin it with a drill, screw a screw into the centre of the end, cut the head off the screw, and hold what is left sticking out in the chuck. Resting the rotating dowel against the bench edge as you are filing will stop it going all over the place. Unscrew the screw with a pair of pliers, and fill the hole, or stick the detonator cap or propellor into it.
An hour should see four done with ease.
Just a suggestion.
Bogs