Well, having a physical coin of bitcoin isn't that a bad idea.
yes its not a bad idea but its a good idea because those physical bitcoins are being used for souveniers .
However, the bitcoin is meant and made to be digital and that was the thing that made it unique compared to all form of currencies.
there are many online currencies out their but the only thing was made bitcoin unique is its high volatile nature .
You can always put addresses to the coin but for me, it is just a waste of time and money.
they cant always do it especially if the coin is small because a public address/wallet address are compose of long text/characters but its not a waste of time and money beause as i said earlier it was only meant for souvenier purposes .