I think I can make such a thing. But, I needed a WMN5290A & A series television for reverse engineering.
After reverse engineering signals that captured from exlink, I can place a utility that emulates A series exlink commands.
So it's highly possible to do such a thing. But unfortunately I don't have even dump wall mount.
If you donate me a one WMN5290A with A series TV, than I can implement it for free
You also reverse engineer this device to make compatible with B series.
But you needed those two devices too for capturing commands from exlink.