We’ve only gotten our cakes at restaurants and room service, not only served with proper professional cake cutter, but when departing with leftover cake was given plastic cutter.
Those bakeries were at the GF, CR, POLY, YC, and BWI.
My daughter and I are celebrating her 25th birthday with a couple of friends at AKL, we'll be getting the cake from Mara, and I want to see if I can get away with not packing a cake cutter!
I would expect if you order a whole cake from room service, they provide plates/silverware and something to cut the cake. You could always ask when ordering the cake. Not sure what a 'cake cutter' is but certainly wouldn't bring one from home. All resorts have knives you could get for that purpose.