In this direction it is worth considering the Keith McMillen K-Board Pro 4 for this. While the keys on it don’t have vertical motion ( similarly with the Linnstrument ) it does have 5 dimensions of sensing on a conventionally shaped keybed. So that includes both the X and Y dimension motion. It also has the four assignable slider controls right above the keys and a fairly reasonable price at $600 USD.
This should pair up fairly well with the Iridium Desktop as well.