Dont you mean just replace VL commands with c#
I mean anything that can implement the VLISP language. . .
(in the past at the time of AutoLISP with a friend of mine
we wrote a small library of functions in ANSI C for ACAD 12,
when there was the ADS (Advanced Development System) . . .)
I mean something like this.
But it is important that it is OPEN SOURCE.
There are many Open Source software . . .
We can at least create an open source VLISP implementation . . .