Hi,
The best way is to use or duplicate the plugin "Collect On Delivery" plugin. It's a manual payment plugin which just ask for a manual validation of the order.
The views of the plugin and translations key are modifiable so you would be able to customize it like you want.
By duplicating the plugin (which would require some development/PHP skills) you would be able to hard code your values directly.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.