Jamil provides a Duvel clone in Brewing Classic Styles. Its pretty easy, goes alittle something like this: 8.4lb pilsner LME, 3lb cane sugar, no grains, 2.25oz czech saaz for 90 min. His recipes are based on 7gal boils, but you can do 3.5gal with half the malt, the rest added at flame out. Hop additions remain the same. His recipes are really on point, and I'm also looking to pitch this onto a Belgian cake this week. Good luck.
-He also recommends pitching the yeast at 64deg, then ramping to 82deg as fermentation progresses.