My DC don't like Christmas pud or trifle either, so DH and I have it at other times during the year on our own.
I go along wih Kittylester, syllabub is lovely and very pretty in a glass. You can make it with whipping cream rather than double (so it is not so rich) and use many types of white wine including sherry, white port, masala, champagne or prosecco. I've also made one with elderflower cordial.
We make a dessert that is layered in a glass, with rataffia biscuits, morello cherries and jelly made with the cherry juice. We layer it with cream, custard, ice cream and decorations and our GC help to make it. It sounds "trifleish" but if you leave out the custard it is not at all like trifle, more like a knickerbocker glory. The rataffia is delicious, much nicer than soggy sponge.