Hi Tony
This is probably not what you expect to hear but, if I was in your position, I'd stay in cash.
Often the best thing to do financially is not to do anything at all.
Here's my thinking:
You're planning to return to Ireland in two years time with your family and, from what you have posted, you have decided that you want to put down roots and buy a family home.
Let's start there.
Notwithstanding our world beating property crash, average house prices in Ireland are still high relative to average disposable incomes and mortgages rates are high relative to most other eurozone countries, with no mortgage interest relief. Variable mortgages rates on new home loans are currently in the range of, roughly, 3.3% - 4%. The more you can put down by way of a deposit, the lower your rate.
At current valuations, it is generally accepted that it will be something of struggle to achieve a nominal return of 3.3% - 4%, after fees, expenses and taxes on the sort of investment portfolios that you have in mind over the coming decade. Over the next two years - who knows?
In my opinion, your priority should be maintaining, and ideally increasing, your cash war chest so that you can take out the lowest mortgage possible when you do come to buy your family home.
Unfortunately, the taxation of passive income from investments is fairly punitive in Ireland outside of a pension wrapper, particularly if you have material earned income. We do have tax-deferred pension vehicles but it makes no real sense to invest in these vehicles with income that has already been taxed or is tax free. We have no equivalent to ISAs or Roth IRAs.