Price on Request items.

Hi,
I've a client who is wanting to add some items to the store that would be 'Price on Application'. Is there any way that the 'Add to Cart' button for these items could be changed to 'Request Quote' and the price shown as 'On Application'?

I'm basically canvassing for workaround suggestions so that the whole process could be handled in OPenCart rather than having to set up new pages for these items outside of OpenCart - unless of course this would be the only way.

Thanks in advancefor any ideas.

John