As the originator of this post, a couple of points in clarification.
Even as a small 'r' republican I think if I were a British citizen that I would be in favour of retaining the monarchy by about 52-48%. It's principal value as I see it is (generally speaking) that it acts as a 'cross-cut' institution that in some way can provide a unifying presence in a society of warring factions. I think countries and nations who can find an institution to unite political and social cleavages do better in the long run if something that pulls them together is stronger than that which drives them apart.
Recent example, Belgium which went almost two years without an agreed government and then the tie was broken when the King intervened and the Flemish/Walloon/French factions realised that they had something in common through their loyalty to their monarch than the tribal separations that drove them apart. I think that in Ireland the cross-cuts have historically been the Church (no more, thankfully) and resistance to foreign occupation and oppression and is now more focussed on being positively active in EU and UN, building a post-Rome liberal democracy, sport in all its forms and, of course, finding something to beat Constitution Hill at Cheltenham next month.
My clumsily expressed opening point remains: even for supporters of the monarchy, why the phuck would a sentient, intelligent person take the knee before another in 2025 because the Act of Settlement found a Hanoverian protestant to bar a Catholic from assuming the throne in 1714?