^^ I don’t think so.
revenue.ie/en/tax/vat/guide/ … l#section4
“Revenue may pay interest on refunds of VAT to a claimant in two circumstances i.e. where there is a mistaken assumption in the operation of the tax made by Revenue or where there is a delay of more than 93 days in processing a fully completed claim. Simple interest is calculated from the date on which the amount becomes payable and is chargeable at a rate of 0.011% per day, or part of a day, during which the amount remains unpaid. Interest will not be paid where it amounts to less than €10 or where any interest is paid due to the provisions of other legislation.”
You won’t earn interest just by chucking loads of money at them.
Besides which, throwing money at the State because you don’t trust them to honour a guarantee is a bit bonkers.