There contracts called an FX Forwards where you can get a feel for what the market thinks an exchange rate will be in the future. Now exchange rates are notoriously uncertain, but it is worth noting that at current prices market believes your Krona will be worth only 0.0003 Euro less three years from now than it is worth now.
So, if you are considering taking money out of your investments and converting it to Euro and missing out on three years of dividends and hopefully capital gains its certainly possible this may work out for you but this is unlikely. If you are at all uncertain that you will actually move this is an even worse idea as paying to convert money twice would be an additional expense on top of the missed returns.
There are FX financial products (futures and forwards) where you can get exposure to FX without having to put the full amount down. This could help hedge your house value but this can be extremely expensive over time for individual investors and would almost certainly not work in your favor.
Something that could help reduce your risk a bit would be to invest more heavily in European even Irish (and British?) stocks which will move along with the currency and economy. You can lose some diversification doing this, but it can help a little.