I have had this type of situation a lot: a relative or friend wants to attend the landing interview to assist with translating and to otherwise help comfort the arriving passenger.
It's not going to happen at non-EU arrival ports in the Common Travel Area except when the Immigration Officer (or An Garda Síochána) invites the friend or relative to attend and that would be an extraordinary situation. It invites security issues like the transfer of contraband for example. Consider a flight from Turkey that has 250+ passengers and each of them wants a friend or relative to attend the landing interview. Now what? They are supposed to flood a secured area with those people? No chance. They especially do not like mixed gender interviews if the passenger is female and arriving from a South Asian locale because it drags in implications of what might be taking place.
Even in the case of removal they will not allow it. It gets even more complicated if arriving children need to be removed.
The authorities are supposed to have translators either present at the port or on call for telephone access. In the rare event they want to speak to you they will contact you by phone or seek you out in the passenger greeting gallery. I have advised relatives and friends to be sure the passenger carries a photo to help the officer spot the person rather than to use the public address.
Also remember that most non-English speaking, non-EU passengers have an entry clearance (or its counterpart, the Irish Visitor Visa) through which the 'heavy lifting' has been already been done.
Alternatively, the larger ports in the CTA have VIP services you can use, but the most common remedy is to have the passenger carry a letter. They will not pay much attention to it, but it may help ease your mind. Also you can join the flight at a leg outside the CTA.
Overall, trying to get in to the secured area violates a prime rule of travelling: avoid anything likely to set off an IO's radar. As always, it's vital to be in the arrivals gallery and have your mobile at the ready.
Adding: there's a special corner case for people who want to receive blessings from an arriving Swami or Marabout and insist on being allowed air side. Things can escalate into religious fervour very quickly when the plane has landed and the authorities will begin to worry. To help avoid potential riots, DUB, LHR, and LGW have a secured room set aside for blessings from swamis and other types of holy individuals, and blessings always take place after the landing interview anyway.
Note: this answer is scoped to living humans only. The arrival of horses, livestock, household pets, penguins (zoo specimens) etc is an utterly different can of worms. Especially getting air side to 'greet' one's horses.