When I do goose I tend to have fewer accompaniments than with a turkey, it's more interesting meat so it needs less I think., Gravy with the giblets, apple sauce goes brilliantly, stuffing - Google one you fancy there's loads of good ones for goose, red cabbage is a must, roast potatoes & sprouts with pancetta, to me that makes a splendid feast, no need to go over the top.
We just have the normal gravy (the Jamie Oliver make ahead one), sprouts, carrots, roasties, pigs in blankets, stuffing and cranberry sauce, no red cabbage for us, also nothing fruit based apart from the cranberry sauce. Traditionally goose is served with fruit based accompaniments to cut the richness a bit. We do have bread sauce but only for my mum, no one else likes it.
No 'trimmings' - here at home it's just carrots and parsnips roasted with the Goose, plus extra red cabbage. Gravy, and roast potatoes. Plus sprouts (plain) because we like them.
Traditionally my German Grandmother (and now my parents) made/make Goose, gravy, red cabbage and boiled potatoes. No need for anything else as Goose is delicious, rich and flavourful . I'll hopefully be introducing Roast potatoes and some extra veg to their household this year (our kids are not so fond of red cabbage...)