I could only imagine what you and the grapejs author could come up with by working together. You both are extremely talented and instead of working on separate projects, maybe there could be some sort of collaboration between you guys? In the era of electron applications, maybe just wrapping grapsjs inside electron could give you the platform version of an editor that you are trying to achieve?
In any event, I wish you all the luck in the world.
In any event, I wish you all the luck in the world.