Hello, anon! Thank you for your message!
As far as the retextures are concerned, sure, I’ll do my best! Just so you know, MrsM’Quve recently retextured Simpliciaty Venus with Io’s textures. You should definitely check her blog out as well 🙂
Unfortunately, I don’t know how to lower polycounts on meshes. Maybe you could try posting a request on GOS in the Wishing Tree section? There are many talented creators who know how to work with hair meshes, sadly I am not one of them.