^Not to be difficult, but the stuff we call canola oil in the US is most definitely not corn oil. Per wiki it really is what you call rapeseed oil, though likely a different variety than yours. (Some cheeky person has renamed the article and built in a redirect so you can't even search for canola oil, even though that's likely the more common name, and the article uses "canola" nearly twice as much as "rapeseed.") Sunflower oil is great, but I'd have said the flavor is a little strong. Again, that might be a difference of variety, since sunflower oil here is mostly a thing used in Asian cooking. But hey, if chocolate is self releasing, then no need to worry.
On the other hand, if you want to channel Matthew Street and argue with me about food, that'll genuinely make me smile. Man, I miss that argumentative curmudgeon. (I say as an argumentative curmudgeon.)