I have done the silica with SS #400 mesh wrapped around it in my RSST and it works pretty well, I cant even get it to dry burn to check my coils after a few days if I need to, I need to use a needle tip bottle to drain the juice in order to get it to dry burn. I showed the guy at my local retail shop and he was surprised it wicked so well. Id say its worth a shot.
I had never heard of this method but decided to try it out of my own curiosity/creativity...I used this for about a week and went back to a straw type today which is skinnier to be prepared for my mechanical mod that is in the mail.
EDIT: I would advise you not use cotton because that would interfere with dry burning to check your coils, dont wanna spend the time to make it only to have the cotton burn. silica can be dry burned and wont catch fire or burn. However I will say with the silica CORE if you change flavors it will hang on, at least it did for me. I went from Mister E Liquid Funny Banana to a Reserve Blend and it slightly tasted like banana even after a few tanks.
I never considered twisting the kanthal,I'm still learning the subtleties of wrapping coils.
I was wondering about double wicking,though. Wrapping the mesh over a silica or cotton wick. Sounds like it would work pretty well but I don't know anyone who has actually done it.