You could easily do that, remove the damage from Venom Spray in the tuning, change Spitting Cobra's ranged damagetype to 1, and change yours to 256. I believe there may also be a seperate damagetype that blinds, but I have yet been unable to find it (mainly based off of BLINDED in the locale and the weird comment for venom radius about what blinding lowers the sight radius too). And don't tell me BLINDED is for flash, cause that is FLASHED, and BLINDED was there in IC. Still bothering me, because DT_Blind, DT_Blinding and DT_BlindAttack all don't exist so I'm wondering what to do next. Still think it's Damagetype 128.
The only problem with using Venom Spray is it will still say POISONED for the status, and not BLINDED.