There really should be a sectarian labour and socialist party in NI, that takes a netural approach on TEH flegs cultural issues of the day.
Guess supporting SDLP, if they still have a reason to exist.
I believe People Before Profit is at least nominally non-sectarian (assume that's what you meant), though as a practical matter they win votes almost exclusively from Catholics.
Yup PBP is technically non-sectarian and campaigns for the rise of the proletariat above religious lines, though basically no Protestants vote for them anyway.