Hmm. Assuming that things turn out broadly like OTL (so there's WW2, a Cold War, and an Iron Curtain), I understand that Sweden would probably be in NATO, though I may be wrong. If that's the case, a Swedish community would be viewed as a security risk. I'm not sure whether they'd actually be sent to Siberia (perhaps just until Stalin's death if at all), but I very much doubt they'd get an ASSR, and they'd probably face passive assimilation into Finnishdom thanks to a lack of minority rights. All the SSRs promoted their "national" language (Tajik prevailing over various mountain dialects, for instance, or Standard Georgian over the minorities).