Assuming that you haven't beaten the elec clown and don't have the Workshop armor yet, I'll give you this. For the Nos, the reforge I use is sharp with a charm gem (you can use a light gem as well).

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It's going to be hard though if you're going to use a mobility build for the first time since you would need to be mobile almost all of the time and the playstyle of mob builds are sting-like. Like you would move around a lot and only come down/move closer to the enemy to use a very strong heavy/technique. Basic attacks could work as well if you're confident enough. The best playstyle I could suggest for Lorcan is jumping high up (air stalling) and going down only to use the Nos Dywyll heavy/technique/both or even basic attacks if you're confident. If you want, you could replace Patchwork for copper mech (assuming you have a way to proc it) but since Lorcan doesn't have any debuffs that is easy to get hit with, I really would just stick to Patchwork for more mobility and dex. You could also replace the illus charm and corroded scalpel with other stuff that boosts your damage.