I'm going to preface what follows by saying VAT is not my favourite tax head, so I'm entirely open to correction on what follows!:
If they are Zero rated supplies (as opposed to margin scheme goods) in the country of origin then you are required to account for Irish VAT on them (ie. 23%) and entitled to a deduction for that VAT, provided you charge VAT on your onward sale of the goods.
If you elect for the Margin Scheme on the laptops you would still be required to pay over the VAT on the intercommunity acquisition (ie. the Irish VAT on buying them in from Sweden), but you wouldn't be entitled to any deduction for that VAT - in other words that VAT would be a cost to you, a laptop that you paid €100 for in Sweden, will have cost you €123 if you opt for the Margin Scheme.
You would then account for VAT on your margin when you sell them on, but in order to make a cash profit, you'd have to sell for more than €123...
It actually gets worse, as I believe there is EU VAT case law (
https://www.kmlz.de/en/VAT/Newsletter_35_2023) that says that the €23 of VAT borne is disregarded for the purpose of calculating the margin, so for margin scheme purposes you would have a cost base of €100 (even though you've suffered €23 of VAT already). This effectively pushes the break even point up by another €5.
So it seems you would be worse off applying the margin scheme to goods purchased as Zero rated ICA's.