I use belgian candi and lyles golden syrup in my Trois Pistoles. Its a dark belgian, but tastes very barleywine-ish with fig/raisin/cherry notes. Most important part is just aging the stuff for 6+ months and let the alcohol flavor settle down into fruit character. You could use honey as well. Just make sure you make yourself an extra large starter for a beer that size. If that ferments out you'll hit close to 11% ABV.