I think, as it is an affiliate link, you would be assigned a number within the link coding so the system knows who and how to pay currency. If you are in Northern Ireland then you would be paid UK pounds as part of the UK. If you are Southern Ireland, then I don't know the answer to that one unless you need a separate link code to modify the currency.
You are asking for a specific code that will link directly to your eBid auction listings and I don't think eBid will do that. I think, if you try to do it yourself, then you may not get your affiliate payments paid out to you as the eBid coding is quite specific in the way it is set up.
I would not worry about the affiliate link, keep it as it is meant to be, you'll be paid anyway. Just place a separate link to your items instead.