I mean, it has been argued before that Western Europe is all protestants and Latin rite Catholics, which would make the Visegrad countries part of Western Europe.
Edit: Germany historically has included modern Czechia, much of Poland, and Kaliningrad at one time or another.
Oh i wasn't aware of it, the main definition of western europe i had known was of those countries that were outside the warsaw pact and either inside nato or friendly to the US, maybe because i'm not from europe we may see those issues more as part of something political rather than cultural
I mean, technically, the Slavs and their sphere of cultural influence (Romania, Albania, Moldavia, the Baltics) are seen as eastern Europe, with Hungary being sort of undefined. The religious and political division can be used, but the way I see it, eastern Europe is usually defined as the (OTL) Balto-Slavic cultural zone, and sometimes Greece & Hungary.
Like I said before, the easiest option is a surviving Great Moravia, just thought I'd give you a map of it at it's greatest extent, in case you need it:
Another possibility - Alpine Slaweni/Karantjani:
Swiss or Austrian Slavs are pretty plausible. There were Slavs in eastern Austria, so if they were to just migrate a little further west...
Slavs that migrated into the alps would have a strong position to defend, and, much like in the similarly mountainous Balkans, would be hard for other groups to assimilate, due to their ability to just go deeper into the mountains until they're strong enough to push the invaders back. Also, the area of Switzerland is near impossible to invade. Basically if a Slavic group established itself there, it would be hard to push them out, and they would at least survive as a plurality. They'd likely end up like the Czechs, becoming catholic, and slightly Germanized, incorporating into Frankia, and later the HRE, but breaking away as the empire weakened (probably around when OTL Switzerland did). They'd likely have a half reformation (due to their location between the centre of Protestantism (Germany) and the centre of Catholicism (Italy), like how Switzerland is split between Catholics and Protestants who tolerate each other.
These Slavs would likely be descendants of the Caranthians (who lived in southeastern Austria and Slovenia).
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