I doubt it. Your accent will be so bad they won't understand it, the joke'll fall flat and you'll start off feeling like a plonker."Hajime ni, Rajio Taisou Shimashou!" It would probably get a laugh.
With the palm facing upwards.Something you should try not to do is point with one finger if you have to point at someone, use your whole hand.
Do NOT add it to your own name!Also, they'll most likely introduce themselves by their last names, and it's appropriate to add 'san' like Miyagi San to the end of their name, it's basically 'Mr.' But remember, it goes after the name. Mine would be 'Jenkins San'. That's 'San', and is 'Sawn', not like Sans Serif.
Do NOT make joke with international clients for 2 reasons:"Hajime ni, Rajio Taisou Shimashou!" It would probably get a laugh. Work places and schools do Stretching exercises every morning, and they just listen and do it to a recorded voice, so this is basically saying 'To begin, let's do Radio Exercises!'. They'll know exactly what you're talking about and laugh, I'm positive. If only I could help with pronounciations on here...