I think gloss black would look fine with alpine white, certainly for the lip. Hard to say how a gloss lip will look with carbon fiber splitters without seeing it in the flesh. Here are a couple of sites with pics. Seems alright to me.
https://www.autotecknic.com/product-p/atk-bm-0017.htm
http://f80.bimmerpost.com/forums/sho....php?t=1030996 (More satin sheen on the lip)
My personal preference is to leave the splitters body color. But I'm probably in the minority there.
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2018 F80 M3, Mineral White, Full Sakhir Orange, ZCP
2015 F15 X5 35i, Mineral Silver, Terra Dakota (Retired)
2012 E89 Z4 35i, Deep Sea Blue, Walnut Kansas (Retired)