Hi silphium,
There is more about choosing a topper in post #2 here and the topper guidelines it links to but if your mattress is already a good match for you in terms of PPP I’m not so sure that I would play with success because a latex mattress has a different feel from a typical pillowtop mattress and you won’t really be able to “match” something as subjective as “feel”.
I don’t know what is in the top layers of the Ceasar’s Palace mattress you slept on so I don’t know which type of topper would “approximate” it but some type of cheap eggcrate foam or a solid layer of soft polyfoam or a synthetic polyester fiber topper would probably be “somewhat close” to a similar “feel” although the tradeoff is that you will lose some of the “feel” and performance of the latex.
An inch or two of Talalay in a softer ILD than your top layer would give you some additional softness and pressure relief as well but may be somewhat risky in terms of alignment if your mattress is already a suitable match for you. A shredded latex topper may also give you some additional “cush” as well with less alignment risk but this will also have a different “feel” than a typical pillowtop that uses polyfoam or synthetic fibers in the pillowtop.
Phoenix