You know, I do that all the time. If I have to do a sulfate wash, I mix my old Suave clarifying shampoo (I can't believe I used to use that every day!) with my co-wash conditioner to make it a little less harsh. I've mixed conditioners before to get the effect I want, and I've also mixed styling products.
fia 2C/3A-F-iii, sensitive to some proteins
CGish since 10-16-08
Low-poo: Yes to Carrots Daily Pampering Shampoo (1-2x/week)
Rinse outs: Yes to Carrots Pampering Mud Conditioner
Styling: a little bit of leave in and a little bit of KCCC, diffusing
Olive oil DTs, honey rinses in the summer