Unfortunately I do not own allyl cylohexyl Propionate, so I can't say anything about it. Pineapple materials I know are the classic Ally Amyl Glycolate and Allyl Alpha Ionone (Hexalon) though I haven't played enough with the second one.
I can imagine that the first one could help you with the syrupy feeling as it's quite "dense" even at low dosage. Ethyl Maltol may surely be the right sweetener for syrup, but maybe someone more knowing might be able to tell alternatives.
As you might already know, be careful concerning dosage when integrating the Accord later - both Allyl Amyl Glycolate and Ethyl Maltol are very powerful and might easily overtake.
Edit: I can imagine that you'd need some other material for the syrupy feeling, density, viscosity... you know what I mean? My English is not the best.