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Good point on the courier... there's a guy in Ireland who's really well known and regarded for bike collections in Europe and I suspect he would actually be quite helpful in that regard...
I'm not entirely fixed on wanting a specific bike to be honest, more that I just want a cheap bike that's not absolute scrap and the thing is a <€3k bike in Ireland is likely to have lived outside year round, not taken good care of and hooned... seems like the same bike in Germany will have been garaged and TÜV tested so likely to be in much better condition!
I've done this for bikes in Northern Ireland. My main piece of advice would be buy the seller not what they're selling. If you're bank transferring for something you haven't seen then it's always dodgy, but haven't been burnt yet. I've asked sellers to sign a very basic contract/receipt as some insurance but doubt it would hold any legal currency. Couriers can also help as an intermediary but some are more accommodating that others. If it's not a rare bike then possibly worth questioning if the risks are worth it. Best of luck.