Any way to have special price for certain credit card holders?

The first 8 digit of the CC number identifys the financial institude issuing it. I am currently on WorldPay module for CC processing. I am trying to tie up with a bank such that their customers (identified by the CC they use (first 8 digit)) have promotional prices for certain item or all items.

How can this be done? Is it done on the WP module or what? Any recommendation or lead appreciated.

You could use Group Pricing, but that would require you to manually add the user to a group AFTER you've got their card details.

Someone with more knowledge than myself may be able to figure out a way to code to automatically add clients to a group based on your criteria.

Sounds great, but i think it may take ages if no one has the same need as me.
The other way i am thinking is to activate cc module, and get those customers to use the cc payment module instead of the wp module. Then i will have to manually process them. On top of that, a discount to total by payment method to give a flat discount. but i cant get the discount module to work with 1.36, it was from 2004. darn

anyone can convert the discount on order total based on payment method method to work on 1.3 onwards? Or anyone know how it can be done? I am looking at all the codes and know nuts about it.