I find off whites are always a bit of a problem sometimes they have a yellow, brown or gray base so nothing is simple. IMHO I would just do all new cabinets and be done with it.

If the peninsula cabinets are off-white, I assume they are painted. Can you have all the cabinets painted white?

I inquired about painting the cabinets to match but the cabinets come from the factory painted perfectly and I was told it can't be done and look good

I keep worrying that the cream will look dirty against the white ceiling and adjacent white moulding. It kind of does now with the current kitchen but the whole kitchen is so old that your eye is distracted by the myriad of other flaws

I don't know why painting everything the same color is not possible. Ask other cabinet makers for their opinion.