Costumers data in woocommerce_checkout

woocommerce_checkout is where costumers write their own details as well as a possible shipping address.

I am creating a local web-shop and have only given permission to costumers from one country – Danmark.

I would therefore like to clean up the woocommerce_checkout a little bit:

1) Country selection should disappear when I only chose one country.

2) after choosing “Danmark” from the list containing “Danmark”, the city name box and the postalcode/Zip box shift places to the order which is correct for my country. The order should be correct from the beginning if I only have one Country.

Is it possible to include these changes by writing my own woocommerce_checkout?

http://wordpress.org/extend/plugins/woocommerce/