When thinking about it, it should work and is doable only on kernel side. When display device is slow (like VNC over network or this adapter) the trick is to not to update whole display periodically but send only changes in smallest possible rectangles when they are actually drawn. Problem with this in general is to find out where on the screen something changed. Good news is that we already have this problem solved because of external videochip in our tablets. It already works like this so this kernel hack can just hook into omap framebuffer update commands and send same rectangles sent to Epson chip over USB too. Or better just record rectangle coordinates and send relevant rectangle data asynchronously with some clever skipping/merging when it becomes too fast. I hope they will make the source public. If not, this is possible to reimplement as opensource (with enough time and motivation).