Wouldn't it be possible to creat a "pseudochip" using an SMD version of the 65C816 on a small PCB with Sally-like pins that does whatever conversion is required to make it work? You probably gather from my description that I am not an electronics guru but there are devices like SwinSID for the C64 that are built that way.
There might be hope for the 400/800 as tf_hh wrote that he might make a new edition of the SCCC 65C816 compatible.
That is sort of what our Sweet-16 is. a 40 pin DIP 816 on a small board not much larger than the chip with a GAL on the underside of the board.
Picture in this thread: http://atariage.com/...-2#entry3772018
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