It probably is possible, but whether it is a good idea or not is a different question. By refinancing over a longer term, you will certainly be paying more interest to the bank over the lifetime of the debt. Some banks will allow you to add debts like this onto your mortgage, so you benefit from lower mortgage rates, but keep the repayments over a reasonably short term. You wouldn't notice a dramatic cut in your repayments with this approach.
You're probably aware that €80k is a pretty good income - Is there anything you can do to reduce your spending?