

Have you tried one of the European buttercreams? Italian Meringue Buttercream and Swiss Meringue Buttercream are both made with whipped egg whites, granulated sugar, and unsalted butter. They are very creamy and buttery and just the right amount of sweet.

Just what prterrell said, the meringue butter creams are generally not considered overly sweet.
Or you could blend your favorite American b/c and meringue b/c together for a less sweet icing:
http://cakecentral.com/cake-decorating-ftopict-28824.html
HTH

There is a recipe for Charlotte's Whipped Cream Buttercream in this thread. I thought it was quite nice...not too sweet and not too buttery.
http://cakecentral.com/cake-decorating-ftopict-674551.html

That recipe is also in the CC recipes section:
http://cakecentral.com/recipes/2019/whipped-cream-buttercream-frosting
HTH

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