That's a very neat idea. It's similar to Daniel Garcia's coin thru glass effect. One bit of advice is to avoid the (ever so) slight motion of "tossing". It happens when people do the MP, but in this case, you should work on totally avoiding the motion. Again, it looks great, I wish I'd thought of it first.
Currently Reading "House of Mystery" (Abbott, Teller), Tarbell, Everything I can on busking