Searching descendants of Alexander Campbell born in Islay 1771

[Norwegian Campbell]

Greetings from Oslo Norway!
I am a descendant of James Campbell that arrived in Stavanger Norway from Argyllshire in October 1736. Through wideranging DNA-testing, I have been able to ascertain, that both James and Alexander, descend from the same male line, and that they most likely are descendants of Sir James the 5th Baronett of Auchinbreck. Alexander would be my three great grandfathers half second cousin. Alexanders father is Collin, according to the Islay church records. We then only should lack one generation to link James with Collins dad, that according to my research should be half brothers. I am seeking male only descendant of Alexander. That would be most helpful, but also going through your autosomal Myheritage and Familytreedna hits could be of great help regardless of whether you are male only descendant or not. Most grateful for any info of Alexanders ancestry and descendants.
Greetings from Vidar Birkeland in Oslo