Is it natural vit e powder?
If so, another alternative could be to feed synthetic vit e powder instead (at double the natural dosage). I have a pony who refuses to eat the natural powder but will eat the synthetic.
Not an oil, but liquid - I use Nano-E which is water soluble. Expensive but seems to be palatable, even though (to me) it has an odd smell. Both my horses are fussy but don't seem to notice it in their feed.
I used equimins oil but now I am stuck and I hate the powder. Didn't find nano worked that well and very expensive. I use Holland and Barratt nat vit e capsules for some of mine in a small handful of wet feed.