You could take the view that in the current climate, a secure Cash fund is the way to go. Whilst secure, the actual return will be modest and likely to get even more modest as rates come down.
The other approach, for someone who left it so late to fund a pension, is to go for broke. Go into equities (something high risk/potential high return) on the basis that the safe approach will beliver very little (€35pm) in any event.
The only other factor to bear in mind is what he will do with the fund on retirement. If we has to convert the bulk of the fund into an annuity (€35pm) which will be taxed, then either approach can be justified.
However if he can take the full fund tax-free (under the 150% of Final Salary rule, if no other occupational pension) then the conservative route becomes more attractive i.e. tax relief on contributions going in )both PAYE and PRSI) but tax-free on the way out. So even if the fund simply remained level, there is a 20% plus tax gain.