Option 1
The first is to simply reduce the amount that I overpay my mortgage each month from €500 to €308.33 (€7,400 divided by 24 months) and continue as normal. In this case I would do something with the difference of €191.66 such as save it, invest it or use it to buy health insurance (which I currently don’t have).
Option 2
The second is to take the €3,000 and pool that with a €4,400 loan from the Bank of Mam and Dad and just pay the 10% off right away. I believe that would lower the monthly repayment amount a little and instantly give me a €2,845.86 saving on interest while also reducing the term of the mortgage by one year and nine months. I could then forget about it until the fixed-term ends and busily go about paying back my folks for the interest free loan.