Personally, I would not lock into a 1.5 year EBS term deposit or a 5.5 year An Post term deposit right now. Interest rates are only likely to head north in the medium term and term deposit rates in tandem.
In your circumstances, I would put the whole 52,000 EUR into an 11 month term deposit with Irish Nationwide @ 3.81%. Your deposit is 100% state guaranteed, it is the highest short term deposit rate currently and term deposit rates might be higher in 11 months time when it matures.
Also, you mention the government guarantee period, the above term deposit expires before the end of the guarantee period. (100,000 EUR will be covered post guarantee period as things currently stand.)
Also, of note, the EBS 1.5 year EBS term deposit rate offer expires shortly.