You could go directly into the code and set it up that way, but if you make any changes to the cart it will undo your additions.
The main problem is that the cart is not designed to work with options that change the price through a selection in the cart itself. The ideal way to do this would be to use calculations to determine the price based on the value of the option. This would work out if you had the value of the option stored along with the option name. If you had it setup this way it would allow you to make edits to the cart without undoing your changes.