I've recently began using my Bhringaraj oil as the base for my sulfur powder mix. It's been a couple of weeks now that I've been using it regularly. I haven't had any adverse effects.
I've also read of ladies using Vatika oil as a base for sulfur powder mix.
I say give it a try with a small batch and see how you like it. If it doesn't work well, you can always add the oil to your DC.
Forgot to mention that I have added sulfur powder, along with my ayurveda powders, to my condish in the past and used it as a daily cowash. My hair responded well to the mix.
Yes it is homemade. I use a grapeseed oil base with a little EVOO.
I add some bhringaraj powder, sulfur powder and (recently) some nettle root and horsetail powders. I add lavender, grapefruit and peppermint EOs for scent.
I make a big batch and add it to my condish mix or to the MT that I'm trying to finish up.