I don't think you will find an easy solution. The Xceed system was unique and also patented, so maybe that discouraged others from doing the same. Something feasible would be the "poor man's" grayscale project where you put in a monitor of the appropriate size inside the chassis, using its electronics/PSU. I bet something similar could be designed using the stock analog board, but with a modified CRT board that interfaces to a custom adapter between the Lapis, SE/30 analog board and new CRT board.