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I'd like a German and a Welsh edition, plus the Swedish or Finnish ones with those Tove Jansson illustrations - the latter more for the pics admittedly

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That makes two of us at least vis-a-vis the Jansson version.
As for aquisition of foriegn editions, and seach through the e-bay store collections might be renumeriative. I know for a fact that several of the easter European dealers have copies of some of the old Russian and Eastern European edtions. Admnitted they are not cheap, even less so with shipping to here but they are available. below find a list of some I saw in the last few minutes
baron777 (Latvia) : Roverandom (in Lativian), The Fellowship of the ring and the two towers, (both in Russian), the Hobbit (Latvian)
zulfia_ru (Russia): Hobbit (Russain) Lord OTR plus hobbit (Russian)
ankara2001$ (Turkey): LOTR (Turkish)
Haarick (Estonia): A Lot of diffenet Tolkiens mostly in Russain a few in Lativan or Estonian
Russain and Ukraina books (Ukraine): Hobbit (Russain) Guide to Tolkien (In Russain)
Other undoubetly exist this is just a quick list of the ones from those sellers I already had on file.