I've grilled pineapple with just about every sweetner imaginable. Honey, brown sugar, raw sugar, syrup, etc. etc. and every combination thereof.
For me, plain unadulterated pineapple is best! If it makes ya happy to brush with a neutral flavored oil...go for it. Mostly have fun and.........
There is only one Quality worse than Hardness of Heart, and that is Softness of Head.
Kool-Aid...Think Before You Drink