If you're going to allow infinite engineering effort then I propose going all thermodynamic and having a VERY large piston connected to a small volume, change t

If you're going to allow infinite engineering effort then I propose going all thermodynamic and having a VERY large piston connected to a small volume, change the volume and therefore pressure of a large quantity of room temperature gas, perhaps a short hydrocarbon like butane or propane or chlorine or ammonia or any one of numerous refrigerants, then the piston can vary the pressure setting the fluid level without moving anything but the piston. It may not be fast but computers can be very patient. Given some pumps and mixing vanes it could generate a ton of thermodynamic data. So toss in a piston, hit start, come back a couple days later to a 3-d model AND chemical composition data.