Best bet is a 'kazoo bridle' around your neck to hold
the kazoo about an inch in front of your mouth. I make
them from old wire coathangers! Nothing technical, you
can bend the original Hook on the top to hold the kazoo
and if it is not stable,a small rubber band will hold it!
Then the tambourine should be (if you are playing your
ukulele) flat on the floor,and just tap your foot on it!
Kinda 'one man/woman band' effect, but very cool once
you figure it all out and it comes together!