My experience is that paper tone is mostly set in manufacturing, but it can be influenced by the developer. You can usually get at least a warm neutral tone out of a warm tone paper by using a cold tone developer. If the paper is not really warm toned, you can probably get truly neutral tones, although some paper developer combinations have a bad way of going greenish black.

As I recall, the conventional wisdom for cold tone developers is to use metol or amidol, make a fairly active developer (usually lower dilutions help here), and limit the amount of bromide to the least you can get away with (benzotriazole (BZT) both helps cool the tone an reduce the fog, so it helps here). There are a lot to choose from (you cited a pretty good one in the original post), and you can sort of look for things that follow the general rules. Things like Defender 54-D and 56-D work decently, and lower dilutions and BZT modificatios may help. There are also a number of Agfa (Ansco) and Kodak formulas that you can use as wellas a whole range of Amidol formulas.