The New State pension in UK is now about £155 per week, based on 35 full years NI contributions.
You will not qualify with less than 10 years contributions.
So if you pay £3000, you will be entitled to 155x 10/35x52 per year = £2303. It's a bargain.
Is 2023 the year you can retire here, or in the UK? Would you get the UK pension earlier than the Irish one?
If you you qualify for the full Irish Contributory pension, I don't think you will get any extra for the 7 UK years.
But if you bring your UK NI payments up to qualify for a UK pension, you can receive both UK and Irish pensions.
I would certainly pay. In fact I would be checking to see if I could pay for more than 3 years contributions.
I know you are not allowed to pay voluntary contributions into two EU systems at the same time, but if you are working here, the Irish contribution you are making is not voluntary.
The slight risk is that if you die before you start to draw the UK pension, you will get nothing.