IMO, it depends on the Tyrconnell. I wouldn't use a 10 yo Tyrconnell for a hot one, but I wouldn't have too much of a problem with the basic malt.
But you're diluting (with water and heat) the flavour as well as changing it (with lemon and spices), so I reckon the best whiskeys for hot ones are the blandest Irish blends - Paddys, White Bush, etc. Though some do like a bit of potstill spiciness in their hot ones, which is where basic Powers plays a role. I don't think a potstill-based hot one needs the cloves though.
As for jazzing it up, I dunno. It's a classic recipe, I reckon. One option I've considered would be to dust the lemon with ground nutmeg rather than stud it with cloves. You need to have a light hand, though. Too much will ruin it.
Making it more seasonal? Tinsel around the glass, of course!