commodore 8000 extension above the $8000-$8FFF or $E800-$E8FF

Is there many extension above the area  $8000-$8FFF and / or $E800-$E8FF ?
there is the 64k ram extension
is there any other board ?  superpet ?  madison zram ?

I made a vga board for the commodore 8000...
this board works fine with the base 8032 board
for the 64k extension I'll add it directly on the vga board

I'm trying to list what could make the vga board fail
the board works by capturing the write in the screen memory
it also capture the write in the io area to reconfigure the output in 
case of video configuration change...

one solution is perhaps to add 2 wire for the cs  screen ram / io area
(for example I don't want to capture a write in $8000 but in the 64 
extension)



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