This is a solved problem, I think -- no reason for the Pianoteq team to spend time on it.
Applied Acoustic Systems (AAS) makes the very nice "Lounge Lizard" electric-piano virtual instrument (fully modelled). They also have a percussion synth (also modelled):
https://www.applied-acoustics.com/chromaphone-2/
This looks like a "black Friday" sale price.
The problem is:
. . . What can you use to play it ?
Any timpani player can get subtleties out of their drum that don't flow, easily, through a MIDI data stream. The tone depends on where you hit the drum, _how_ you hit the drum (how long the mallet stays on the head, _which you can control_ with your fingers), how you "damp" the drum (with your other hand), and so on.
IMHO, a timpani "synth" will have the same problem as guitar "synths":
. . . The acoustic instrument responds to the player's input in ways that can be modelled, but that are difficult to gather data for.
Next time in a large music store, ask to play on a Roland "HandSonic" or a Korg "WaveDrum" (rather rare). That will give you a sense of what the problem is.
. Charles
PS -- I have Lounge Lizard, and it's fun to play. i don't know if it's "realistic" (I've never played a real Rhodes EP), but it sounds very good. I haven't tried "Chromaphone".