Just one thing after another?

be gentle - sit him down - give him a carrot and say gently it's totally breedist but you can't join - then get him a pint of guiness and a nice shamrock for his stable and mabe a camoflage numnah so he feels like he's part of his country and is still serving in his own way ! skip the ''novelty '' bit and I'm sure he'd love the idea of getting his own back on one of his military trainers or perhaps the irish sport horse he's riding hahaha.