Hong Kong would probably go as in OTL, unless you did a POD that saw the Chinese civil war last longer, possible to a point where the mainland split into two or more seperate nations or something. But that would be a seperate issue in and of itself.
My best guess to keep a few places more than OTL would be to let some larger territories, likely in Africa, gain independence sooner than OTL. If you already know they are going out, cut your losses and save some time and money. Maybe let India go a year or so sooner as well.
Malta would be a reasonable candidate, though I don't think the idea of integration with the UK would be a good idea.
The Bahamas would be a reasonable candidate to hold onto. Small population, island nation in the Caribbean, where most of the UK current remaining holdings are located. Offer them internal self rule, let them do their own taxes and whatever, the UK will handle defense, handle foreign affairs for the most part.
Seychelles in the Indian Ocean would be a reasonable candidate as well. Again, a small group of islands. Population of only about 70-80 thousand give or take. Somewhat out of the way and not a major player in world affairs. Give them full internal self rule, and again the UK will handle defense, maybe keep a navy frigate based in the area.
Something like those three might be doable. Anything more, and you would need a POD further back that doesn't leave Britain and the empire so drastically gutted from WW2.