If you are playing nyckelharpa I guess that are playing traditional swedish folk music for fiddle and nyckelharpa. Most of this music are based the dances polska, hambo, schottis and marches. When it comes to polska there are very many dialects depending on then local region and the feel and rythm differs with these quite a lot. Even if polska is in 3/4 time one can seldom play it with the right feel and pulse straight from the notation since it is not possible to write it down correctly in formal notation. One need to hear it from another musician who plays fiddle or nyckelharpa and who have learned it by tradition, otherwise it probably never sounds right. Once you know the tune one can have the notation as support but it does not reflect correctly how to play the music. For the same reason I don't think you will find any style in BB that could be of any use. I myself are from Sweden and play fiddle and mainly swedish traditional folk music. I only use BB for other type of music such as american bluegrass, country, rock etc.

BIAB 2025, Studio One 7 Pro, Song Master Pro, Win11 Home. i7-9700K CPU, 32GB, ESI MAYA44eX, Guitar Pro 8, Transcribe, (EZKeys2, EZD3, SD3, EZBass, EZMix3)
Amateur: fiddle, guitar, vocal, beginner on bass.