I found a couple of recipes last night, suitable for Christmas IMHO, for those who really insist they can't cope with Christmas Pud. I think they would go beautifully together, and they are from the Jamie Does...(Spain, Italy, France etc) book.
Walnut, Chestnut and Chocolate Cake (which seems to be a puddingy cake rather than a 'cakey' cake, and has a layer of chestnut puree and whipped double cream, but I'm sure the chestnut puree could be left out if you are not keen, and leave just a hint of chestnut flavour in the cake itself) accompanied by Prune* and Armagnac Ice cream.
Homemade ice creams that contain a bit of alcohol always work brilliantly, because the alcohol doesn't freeze, therefore keeping a nice soft, scoopable consistency to the mix, rather than ending up with a solid block over over-frozen stuff that never quite has the right mouth feel. In fact I would say put in the tiniest splash of vodka or kirsch or something unflavoured) into any ice cream recipe, even if it doesn't specify it. You won't taste it, but it will improve the texture.