How hard would it be to clone DBTS? It seems to me that we have a nearly complete understanding of every file except the exe, and we do fully understand their modern counterparts. As for the exe, everything inside it has been duplicated and improved upon in open source games except VSIM, which doesn't seem all that complicated to me.
Imagine taking the mouse's usual full range of motion, being a rectangle the size of your screen. Then curve it to form a half sphere. Place Enric inside this half-sphere so that his right shoulder is in the exact center. The model for his arm is already jointed and already has a realistically limited range of movement, so if you cause his sword to always point at the mouse, won't that accurately emulate VSIM mouse control? Joystick should also be easy as it can be based directly on the mouse. For keyboard, just assign each of the keys to a point on this sphere.
Wouldn't that work?