I just won an auction of 8020 1010 extrusion that I am planning to use for this purpose. I haven't decided if I will drill new holes in the rail to get the spacing correct, or use the current hole pattern and spacers between the 1010 and bottom of table.
Did you complete this combination in the end? If so, how do you find it. I've seen few setups like this on youtube videos.
I have been contemplating the same idea on the basis that it would be better on space and give me more table top area. I imagine the downside is that you will most likely have to dismantle the router fence etc when using the saw. I also imagine there will be times when you want to move straight from the saw to a previously setup router operation.
The Incra stuff is sweet. I almost sprung for it several times. My only issue with table saw mounted routers is that they are too low. At 6'3" it's about a foot too low for me.